Agent 99's white suit gets dirty after being dragged on the airplane banner. Minutes later, the suit is spotless.
Just before Max falls from the airplane, he has his Swiss army knife in his mouth. He screams as he is falling, but later he still has the knife at Krstic's house. Also all the wounds he inflicted upon himself before falling somehow disappear during his free fall.
After Agent 99 and Max go through the storm drain, Agent 99 takes off her shoes. When Agent 99 is fighting after they both get through the lasers, her shoes are back on.
When Max tries to find agent 13, who is hiding in the tree, he knocks on the left tree (the furthest from the camera). The hole in the tree opens, but when the conversation ends, Max stands in front of the right tree.
While dancing Agent 99 is wearing Heels, she walks off the dance floor following Max and is still wearing heels. As Agent 99 enters the closet there is a glimpse of her shoes and she is wearing flats, and as someone points out that she kicks off her shoes to go through the laser filled room; then she is wearing shoes again and they are the heels she was dancing in.
In the combat training range, the first scene shows a less-lethal ammunition round being fired, and the round hits an agent. The slow-motion scene shows the entire round being propelled through the air, including the casing. In reality, only the "slug" would be propelled, and the bullet casing would be ejected from the weapon.
When agent 99 is talking to the chief on the phone, she suspects max of being a double agent because agent 23 states there was no trace of uranium at the bakery, and gases him. She should never have suspected this after being shot at with automatic weapons inside a bakery. She never once questions why a bakery would need armed guards to protect it.
The symphony abruptly skips five and half entire sections as Max, 99 and the Chief run into the concert hall. At the point where the camera shows the red X on Siegfried's score as if the performance is about to end, there are in fact nearly ten minutes remaining in the symphony.
In brief segment with Max in the F/A-18D Hornet, his flight suit has an "Air Combat Command" patch, which is from the Air Force. The Navy and Marines fly the Hornet, not the Air Force.
When Max jumps out of the plane, his hands are tied together. Moments later, in air, his hands are free again. Max's last shot with the Swiss Army knife crossbow cut the strap around his wrists.
When Max smashes Shtarker's face against the retinal scanner, you can see soft material compress as he hits it. Some simple retinal scanners (in real life) are ringed with softer material to protect the skin and the machine itself, which does compress. It is likely that this particular scanner was one of these, therefore the compression is not a mistake.
When Smart drives through the building, it's an obvious stunt double.
As the Ferrari zooms over the Bolshoy Moskvorechnyy Bridge in broad daylight toward St. Basil's and Red Square, the bridge is completely empty of moving traffic, despite Moscow's notorious traffic congestion. This is like showing a car zooming freely down Broadway or Wilshire Boulevard without another moving vehicle in sight. (A roadblock keeping cars off the bridge can be seen just below St. Basil's Cathedral.)
When the Cessna 206 banner towing aircraft is shown to roll, the ailerons do not move at all. Ailerons, which are located on the outboard section of the wing, are the control surfaces that make an aircraft roll. No movement, no roll.
When Max is free-falling after 99 lets him go, you can briefly see a suit-colored parachute pack on the stunt man.
During the GMC Denali chase scene, when Agent 23 is shown driving, the shifter on the Denali is all the way up, which is the 'park' gear.
Max's pants don't appear to have any rips while he's running through the street to the Walt Disney Concert Hall.
During the concert, there is a cut to a pianist during excerpts of Wolfgang Amadeus Mozart's Symphony No. 40 and Ludwig van Beethoven's Symphony No. 9. Neither composition includes a piano part.
At the beginning of the movie when Max asks agent 23 about his assassination after 23 replies that assassinations are prohibited by executive order 12333, his lips are moving but there is no sound.
The score used by Siegfried is indeed a Ludwig van Beethoven 9th Symphony score, but it does not correspond to the music being played, which is the 4th movement. Sigfried is reading the 3rd movement, starting at bar 119. The end of the symphony is incorrectly marked in red at 3rd movement bar 131.
In the overhead shot of the freeway chase, you can see a California Highway Patrol cruiser holding traffic on one side of the freeway, and a transportation van and the crew on the other side, on a ramp.
When Agent 99 is almost knocked off the roof of the SUV during the I-47 SUV/plane chase, her safety line is briefly visible.
When looking for a ride in the Russian village, there is a spelling mistake on the door of a garage. In two places the Latin letter "N" (with \) is present instead of the mirror image in Cyrillic alphabet (with /).
When Max is shown going to work, we see him heading directly to the old Smithsonian Castle building. When he then enters the building, it is clearly not the Castle but the Natural History museum, which is across the Mall from the Castle and further west.
When Max is talking to Agent 13 in the tree, the Lincoln Memorial is on his left. When the shot angle changes, the WWII Memorial is behind him. It should be on his right.
During the plane/SUV chase at the end of the movie, someone says they are heading south on I-47. There is no I-47 anywhere in California, and if I-47 existed, it would be somewhere in the Midwest. The closest thing to existence would be California State Road 47, which connects Terminal Island to mainland Los Angeles.
When Siegfried's car is driving away from the Disney Hall at the end of the movie, the background keeps changing. First, they are on a street in an industrial zone. In the next shot, they are in the middle of the bridge. After that, they are driving through a neighborhood full of houses.
When Max's watch detects Agent 23's radioactive heat, it should've in fact detected his heat much earlier as they were very close in the previous scenes.
The Russian used in the movie contains many mistakes and absurdities. Sometimes things are completely different from their English translations. For example, at the beginning, "Mr. President, your mother-in-law has arrived" is translated as "Don't worry. The Americans suspect nothing." When Max and 99 are hacking into Krstic's computer, the list of shipments includes "nuclear detonators", along with "dining room chart", "zone's rug" and "steel boots of a foot's finger." When Max places detonators in the bakery, a red sticker on a barrel says "syrup of callus."
When Smart introduces himself to the four young women at Krstic's party, he clearly says "Good evening" in Polish (says "Dobry vyetshoor"), instead in Russian, which should sound "Dobryj vyetshyer".
When Max is reading his notes during the opening credits, there is a reference to the villain The Claw and his assistant "Toto" from Get Smart (1965). The Claw's assistant was "Bobo".
Dalip, is supposed to be a Russian Henchman when in fact 'Dalip' is an Indian name and the real life name of the actor. Also, when fighting with Dalip on the roof, Max supposedly speaks in Russian when he says "Main tennu janda ha" which in fact is Punjabi/Haryanvi, the mother tongue of the actor which translates to "I know you".