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Avengers: Endgame (2019) Poster

Goofs

Jump to: Character error (1)  | Continuity (4)  | Factual errors (1)  | Miscellaneous (1)  | Incorrectly regarded as goofs (10)  | Plot holes (1)  | Revealing mistakes (2)  | Spoilers (21)

Character error 

Rhodes lists several time travel themed movies in which someone changes the past and thereby changes the future. However, he mentions two; The Terminator and Somewhere in Time; that actually work on a different theory, that of the feedback loop or predestination paradox, in which anything done by a time traveler actually causes the past to unfold the way it always had done.
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Continuity 

After the Battle of New York in 2012, Captain America's uniform was very dirty and noticeably torn in several places (as seen in the first Avengers film), but here he is shown to have a pristine uniform after the battle.
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Scott is the the van trying a jump start, we then cut away and he is seen in the background battling a flying monster.
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At the SHIELD Army HQ in 1970, as Rogers signals for Stark that he is ready to leave, we see that Stark is speaking to his father, and as they speak, in the background there are two privates in dark uniform speaking to a officer wearing a beige uniform. As the camera switches between the senior and junior Starks, the privates are still there, but the officer appears and disappears alternatively.
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When Captain America, Black Widow and Ant-Man are having breakfast with Bruce Banner/Hulk at the diner, the breakfast burrito in front of Bruce is cut in half however in one cutaway scene to Captain America and Black Widow, the burrito is not cut in half and whole.
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Factual errors 

The Army fatigue uniform that Steve Rogers is wearing while he and Tony are on the Army base in 1970 has his rank (Captain) correctly indicated on his cap as well as his right collar point. His left collar point has his service branch indicator, which, unfortunately, bears a resemblance to the LtCol rank. The branch indicator isn't clearly visible, but appears to be transportation branch. His uniform, rank and branch, are correct for the time period.
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Miscellaneous 

Hulk claims there's a generator powering the experimental time machine and orders Black Widow to kill the power. When she opens the breaker it can be seen the equipment is actually an air conditioner, not a generator. In the final scene where Captain America is sent back in time, the same air conditioner can be seen "powering" the time machine.
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Incorrectly regarded as goofs 

When Captain America enters the elevator to retrieve the staff from the Hydra Agents after the First Avengers in 2012, Jasper Sitwell is seen using a Samsung S6 which was released in 2015. However, the events happen in a world that is more technological advanced so there is the possibility that the phone was probably created sooner or SHIELD uses technology that isn't yet available on the regular market.
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Tony Stark drives an Audi e-tron gt, which is a fully electric concept car. When he arrives at the Avengers headquarters a loud combustion engine race car sound is heard. However, electric vehicles are a risk to visually-impaired pedestrians, and many countries have legislation requiring them to make a noise ; someone with Tony Stark's technical capability ( and ego ) may well have added a noise-generator which mimics a powerful engine.
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Based on Peter Parker's description, everyone was revived at the location where they first disappeared. This would have been fatal for anyone who disappeared aboard an aircraft (or spacecraft), as their vehicles would no longer be at that location. It was later confirmed by the directors that since Banner merged with Hulk that when he he undid the snap that Thanos performed that he include when reviving the other half of the population be placed in safe secure locations that would prevent their deaths.
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In the final battle, Valkyrie is seen riding a Pegasus. Since Asgard has been destroyed and she has been living on Earth for many years, where did she get the Pegasus from?

It is reasonable to presume the Pegasus are raised in one of the other Realms, or are constructs of the will power of the Valkyrie.
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The car that Stan Lee is seen driving in 1970 is actually a 1971 Oldsmobile Cutlass, as evidenced by the tail lights being horizontal instead of vertical. But 1971 models were released in the fall of the previous year, so it is possible that Lee could be driving a 1971 car in 1970.
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Clint Barton/Hawkeye is ambidextrous, this is apparent from his appearance in Thor when he holds his bow in his left hand as opposed to his right which he does in "Avengers" and onward.
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When Thanos magnifies the holographic reflection of Nebula it is not a mirror image.
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In Avengers: Infinity War, it was mentioned that both Clint Barton (Hawkeye) and Scott Lang (Ant-Man) were placed under house arrest because they chose to return home to their families rather than join Steve Rogers in exile. In Ant-Man and the Wasp, Scott's house arrest sentence ended quite a bit of time before Thanos snapped his fingers. However, in this movie, Clint is still wearing his ankle tracker right at the time of the snap. If Clint and Scott were charged with the same crime, and given the same sentence, then their sentences should have ended at the same time, which means that Clint should have had his ankle tracker removed before the snap. It was never specifically stated what Clint's sentence was when he was placed on house arrest. It should also be noted that Clint freed Wanda from the Avengers compound in addition to aiding Steve Rogers in violation of the Accords, which stands as reason to believe Clint would receive a much longer sentence.
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When Scott is eating a taco, Rhodey lands next to him and accidentally blows the taco away. When Hulk comes around, he holds out two tacos for Scott, who is then only seen taking one. However, he could very well have chosen not to take the other.
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While real-world issues prevented the appearance of the Marvel Netflix characters or the Agents of SHIELD, given the dire circumstances there's no reason why Doctor Strange would not have summoned them to participate in the final battle. Also, Nick Fury and Maria Hill are not present.

Strange is established as having seen the future and is attempting to ensure that they'll have the one future (out of over 14 million possible futures) where they win. The characters who were not there were not summoned, because Strange had not seen them there. They might have been there in some of the possible futures, where the heroes lost. Which would give Strange a motivation to not summon them.
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Plot holes 

When Thanos' capital ship is shot out of the sky during the final battle, it crash lands in the water. Due to its huge size it should have caused a tsunami wave that could easily flood the field of battle from all sides, and thus would require Dr.Strange and the other sorcerers to make a much bigger effort to contain. Dr.Strange keeps handling only the small rift, as if the crash didn't have any effect on the water level.
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Revealing mistakes 

While Thanos is pushing Stormbreaker into Thors chest, immediately after getting hit by Mjolnir, Stormbreaker in Thanos's hand changes into his double-edged sword which was thrown far away as seen just before in the fight with Thor.
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After Barton stabs Akihiko with his sword, the camera pans out to reveal Black Widow watching. If one looks down at Akihiko, the actor (Hiroyuki Sanada) is visibly moving and breathing.
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Spoilers

The goof items below may give away important plot points.

Audio/visual unsynchronised 

As The Ancient One is about to hand over the Time Stone to Banner/Hulk, her back is to the camera. Her jaw is moving as though she's speaking but she isn't saying anything.
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Continuity 

When Professor Hulk is running through the first time travel tests with Ant-Man, Captain America is seen standing between Black Widow and Hulk. When the camera cuts to Ant-Man and back to Hulk, Captain America is now on Hulk's right hand side.
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Near the very end of the movie, one of the scenes shows Thor with a very short beard by comparison. The next scene with him on the GotG ship, his beard is normal length again.
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As Hulk is preparing to put on the new Infinity Gauntlet, the rest of the team prepares for the potential power surge by engaging their corresponding defenses. In one shot, Iron Man is seen with his suit on and has generated an energy shield to protect Clint. However, after Hulk puts on the Gauntlet, the next shot of Iron Man shows him holding the shield, but Clint is no longer behind it.
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The main events of the movie are stated as occurring 5 years after the snap. When the stranded Tony Stark is rescued by Captain Marvel and brought back to Earth, he does not appear to be in the state of mind to immediately start a family. Furthermore, the median time to pregnancy for couples under 37 years of age is 3 months. All that aside, even if Tony and Pepper were to get pregnant immediately upon Tony's return, there is still the prerequisite 9 months of gestation. Consequently, Morgan Stark could not be much more than 4 years old at the time of the main events. She appears to be (and the actress portraying her is) at least a year older than that.
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When Avengers attack Thanos in the Garden for the first time, right after Thor cuts off his left arm, Captain Marvel is choking Thanos while War Machine holds Thanos' right arm. At that time Thanos explains that the "Stones served no purpose, beyond temptation" and Bruce Banner in Hulkbuster gets mad yelling "You murdered trillions!" and in the next scene, less than half a second later, Bruce is seen pushing Thanos while seemingly nobody was holding him and they were standing at least several feet away.
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Miscellaneous 

When the Ancient One pushes Bruce's astral body out of his physical, she still communicates with him normally without entering the astral dimension herself. In Doctor Strange, it was established that both people have to be either in the physical or the astral dimension together in order to maintain communication - this rule is obviously broken during Bruce's conversation with the Ancient One in this movie. The only exception to this rule is when the wizard in the astral dimension should break through into the physical dimension to make such conversation (like what Strange did to Christine), which Bruce clearly doesn't have the power to do. In addition, that same movie establishes that the astral dimension moves at a much faster time rate than the physical, yet Bruce and the Ancient One converse in real time.
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Incorrectly regarded as goofs 

A major plot point requires them to return the Infinity Stones back to right after they were taken, so as to not create new time lines.

But for almost every stone, it's going to be difficult, if not impossible, to return it without anyone seeing the difference - some stones were stored in containers that were broken, others were in artifacts that were destroyed to get to the stones.

Further, when Steve Rogers goes to return them, we very specifically see him with ONLY the stones, and not their original artifacts, or any way to repair the containers.

Apparently Steve must only deliver the stones to the moment they were taken from the past. Because as the Ancient One explained, the stones create the flow of time and removing one of the stones causes that flow to split. So Cap didn't have to (let's say) put the Aether back into Jane. As long as the Aether (reality stone) exists in that timeline, that's enough for the timeline not to split.
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There are two Infinity Stones on Asgard during the Time Heist: the Aether (Reality Stone) embedded in Jane Foster, and the Tesseract (Space Stone) in the vault. Given the volatile situation at the Battle of New York, it would have been much simpler to acquire the Tesseract from the vault. However given Thor's state of mind during the planning he's probably forgotten about the Tesseract being on Asgard. Plus it seemed easier to acquire three stones at once instead of two. Also who knows what kind of security Odin had for the Vault after the events of the first Thor film.
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In the after credits of Ant-Man and the Wasp (2018), Scott and Hope can clearly communicate with radio in the quantum realm without time delay, but in this movie, it is stated that 5 hours in quantum realm equal 5 years in normal time.

It was never actually stated that 5 hours of quantum time is directly proportional to 5 years of real time. In that same scene from Ant-Man and the Wasp, Janet warns Scott to not get sucked up into a time vortex, which makes it obvious that he did accidentally travel through a time vortex and ended up five years in the future. Scott was very well aware of this, which is why he proposed to the Avengers to find a means of controlling the time vortex so that they could use time travel to reverse Thanos' actions from Infinity War.
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Thanos wipes out 50% of the population in Infinity War - a society could survive this (and does). But when it is reversed, more than 5 years later, it is unlikely a civilization could survive the instant doubling of it's population. A sudden influx of a small percentage of refugees moving across borders is seen to be catastrophic in the present day.

The population is more than doubled, since some births would have occurred in the intervening 5 years. They'd live at the same places, that they had five years ago. When Scott Lang makes it out of the quantum realm, he walks past rows of empty houses.

As for food, when the snap is undone, Scott sees birds suddenly appearing, suggesting that the snap extended to animals as well, which would now have doubled (supplying people with more to eat). fields on farms could be replanted, since with fewer people to feed, the fields would've been left to fallow. In Infinity War, Thanos notes that Gamora's planet had a surplus of food and resources, after he wiped out half of the population. Applying it to Earth, the world would've had a surplus of food, for the last five years. At worst, society would have to institute ration cards (as many countries did during the world wars), until more food can be produced.
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Thanos being removed from 2014 would not prevent the events of Infinity War, as The Ancient One clearly stated that making changes to the timeline creates other alternate timelines.

When 2014 Thanos arrives in the present day (thanks to 2014 Nebula) this would create a time paradox - as Thanos no longer exists in the past the events of Avengers: Infinity War would not come to pass. Thanos would not be around to collect the Infinity Stones and the Snap would not happen. Akin to the 'Grandfather Paradox' The other explanation for this is the events of Endgame create a slightly alternate timeline, whereby the events of the MCU remain unchanged and cannon while a new alternative timeline has been created in another reality whereby Thanos disappears from events in 2014 and the Infinity War storyline does not take place - similar to the conversation between Bruce Banner and The Ancient One. Another possible explanation is that, when the stones needed to be returned, Steve Rogers had to return them to almost the exact moments from whence they were stolen, which means that he would have returned the Power Stone to the moment in 2014 when Thanos and Nebula still existed.
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Multiple heroes have the fully assembled Infinity Gauntlet in their hands during the final battle, but nobody thinks about using it. Nor does anyone try to at least disassemble it, which would already prevent Thanos from repeating the snap. But it was established that using the Gauntlet would kill the wielder, so such a plan would be implemented only as a last resort.
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Tony's use of the stones is inconsistent with what was established in previous films, especially with regards to the power stone, which is capable of destroying whoever touches it almost instantly. Tony's gauntlets would have required substantial modification to protect him, and the Avengers are seen completing the fabrication of their gauntlet right before the Hulk uses it. There would be no time for Tony to replicate the gauntlet for his armor before the attack.

In previous films (more particularly Guardians of the Galaxy), it is established that only direct bodily contact with an infinity stone will cause that person to be destroyed, unless that person is a species that could withstand it (such as a Kree, Celestial, Titan, etc.). It's also established that any kind of weapon or gauntlet would allow the wielder to use the power of the stone(s). This being the case, Tony attaching the stones to his Iron Man gauntlet would have allowed him to use the stones (although still having a huge amount of energy flowing through him), but it is perfectly accurate that the energy was enough to kill him when he snapped his fingers.
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Gamora died to get the soul stone in Infinity War, but she is replaced with old-Gamora in Endgame and continues to live in that time line. If that's possible, the Avengers could also get Black Widow, Vision and Tony Stark back. Simply travel back to retrieve an old version of them and place them in the current time line. At the end of Endgame we see Hank Pym so the Pym-particles should not be a problem. Also, Captain America is travelling back anyway to put the stones back in their original time lines. He could have gotten all missing Avengers back, not just Gamora.

First as stated by the Ancient One the Infinity Stones are essential to the flow of time and since Vision has only ever existed with Mind Stone in his head cannot be brought to the current time line as the stones had to be brought back to their original places.An while bringing Black Widow and Tony from the past could work it would defeat the whole purpose of their sacrifice to save the universe. Also it has to be taken into Account that Doctor Strange already saw all potential time lines and the only way for them to win was for Tony to make the ultimate sacrifice - if Tony lived then the outcome would not happen.
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When Thor and Rocket are in the past discussing their mission, a disposable coffee cup with a lid can be seen next to Rocket while he is standing on a pillar.
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When the Avengers time jump to the various points in the past, James' War Machine helmet encloses him. However, when he and Nebula are about to time jump back to the present the normal time-suit's helmet encloses him. Furthermore, when all the Avengers meet back in the present we can see the War Machine helmet is back on.
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When present day Nebula kills past Nebula, Present day Nebula does not die. This is because it's stated that changing the past doesn't change your timelines future, but instead creates another timeline where the change made by time traveling is that timeline's future. Beside that, when Steve Rogers went back to return the stones, he would have returned the Power Stone to a point in 2014 where Nebula was still there and alive.
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When Captain America enters Hank Pym's office in the past, the door reads "Dr Henry Pym". Henry is literally his name. Nick names are common in spoken vernacular, but in a government facility, his real name would be used for his office.
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Plot holes 

Laura Barton calls her husband after being revived. Her identity is shown on his cell phone's screen, indicating that it must be a saved number. However, as Clint has been traveling the world as a fugitive for 5 years, whatever cell phone plan his family has been using would have been discontinued, as would the land line on their abandoned farm. Even so, Clint would not keep a cell phone as he could have easily been tracked with it.
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After the snap is undone, Dr Strange brings every resurrected superheroes to the Avengers HQ. Everybody arrives from where they died in the previous movie. This is impossible, as Strange never even met most of them, not to mention knowing where the Wakanda battlefield or the rooftop where the Wasp died is.
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