When "General" Moses is challenged by armed guards, they give him a hand salute. Armed guards in the performance of their duty would not lower their weapons to hand salute anyone, and these guards in particular are not military service members so they are not required to salute anyone under any circumstances.
Frank's decision to wear a US Army General Officer's uniform is an interesting choice for infiltrating the CIA headquarters. The CIA is not actually part of the Department of Defense, so access for military personnel would be granted on a case-by-case basis, and it is unlikely that any military personnel would have unrestricted access, let alone unaccompanied access. Frank wears the uniform of a four-star General, which is particularly risky since federal law restricts the number of four-star Generals that may be on active duty at any given time (the Army would have had around ten at the time of filming), and it is hardly beyond the realm of possibility that security personnel at CIA headquarters would be required to know each of them on site for exactly this reason. Next, while Frank does a good job of putting together a tailor-fitted Army Class-A uniform on short notice (particularly for a film), he does make a number of errors: 1) He does not wear any regimental insignia above his Meritorious Unit Commendation on the right side of his service jacket. This is particularly important to an Army General Officer since by definition they do not wear branch insignia, and a General would want to display regimental affiliation to indicate his past branch. 2) For the number of campaign ribbons he wears (the Armed Forces Expeditionary Medal, the Southwest Asia Service Medal, the Afghanistan Campaign Medal, and the Iraq Campaign Medal) there are two items noticeably missing from his ribbon rack, namely a bronze numeral on his Overseas Service Ribbon (to denote multiple awards) and the NATO-ISAF Campaign Medal (universally awarded by NATO to US Military personnel who served in Afghanistan). 3) Assuming the film occurs during the period it was filmed, Frank should actually be wearing more individual awards. A US Army four-star General Officer who served during the Global War on Terror would almost certainly have been awarded at least one (each) Defense Distinguished Service Medal, Army Distinguished Service Medal, and Defense Superior Service Medal. The highest award Frank wears is the Legion of Merit. 4) Also noticeably absent is the Bronze Star, which is commonly awarded for meritorious service (or valor) in combat to Army personnel between the ranks of Sergeant First Class and Colonel. 5) Frank wears the Army Staff Identification Badge on the right side of his service jacket when it should be worn on the left side. Finally, for someone who is supposedly a Veteran of the US Marine Corps, Frank's salute is terrible.
(at around 16 mins) After making the call on the pay phone, Parker's character pronounces the name of the city in Alabama the same way one pronounces "mobile" phone. The city is pronounced "mo-BEEL." This is surprising, as Mary-Louise Parker is from South Carolina and the pronunciation of Mobile is widely known in the South.
After they exit the CIA building and enter the ambulance, there is a clock behind them showing 9:45 as the time. After they are gone from the place and are traveling on a highway, another shot shows the clock with the same exact time as before.
When Frank, Sarah and Marvin are waiting in the hangar. In the long shot showing all three, Marvin is holding his stuffed pig by the tail and the legs are toward the camera. In the closeup seconds later the back of the pig is towards the camera.
When Cynthia Wilkes brings hostage Sarah to the limo, Cynthia enters the limo from the right side after Sarah, sitting her on the right side. When the limo arrives at the power plant, Cynthia exits the car first - at the left side.
When Marvin grabs the woman at the airport in Alabama, he's holding the stuffed pig in his right hand. A second later, he pushes her against a wall and he suddenly has a pistol in his hand and the pig tucked under his arm. Also, he cocks the pistol, but a shot or two later it's uncocked again.
When Ivan and Frank first meet, Ivan proposes a toast to the love of his life, Veronique - but we later learn her name is Victoria. Seems an odd pet name to use, not to mention that we also find out his pet name for her is "Bunny".
After Moses inserted the syringe into the gunman's neck and he has fallen down, it tilts to the right. Then, while the grenade is exploding in Moses' house, the dead gunmen with the syringe in his neck can be seen. Now it sticks upright in his neck.
When the outside of the hotel in which the VP gives his speech is shown, you can see a large Canadian flag. This is because even though the scene is suppose to take place in Chicago, the location is The Royal York Hotel, located in Toronto, Canada.
Marvin lives in an underground bunker in Florida with a vault. Not only is there no explanation as to how he managed to install a vault, but also very few houses or buildings in Florida have basements due to the high water table.
When the team traps the Vice-President's group in the parking garage, Victoria (Helen Mirren) is firing a 50 caliber machine gun at the group to keep them pinned down. An ammunition can is visible hanging off the weapon's left side. The armor-piercing ammunition readily pierces the vehicles.
The 50 caliber weapon is a belt-fed machine gun. Its large ammunition (5.45" in length) is usually fed from an ammunition can weighing 35 pounds and holding 100 rounds. The weapon at the sustained high rate of fire shown would be firing 450-550 rounds per minute, requiring it to be reloaded with a new can about every 13 seconds.
Before and after the VP's security team flanks the weapon and discover it is unmanned, it has been firing for at least 30 seconds without being reloaded. The armor-piercing ammunition would not only have easily penetrated the vehicles but the people hiding behind them.
When the bullet hits the RPG head on, it explodes "backwards" towards the shooter. An RPG is a shaped charge designed to blast forward and burn through armor. Assuming it explodes at all, the blast would have moved forward.
When Joe is introducing Victoria to Sara He says, "she is an artist with an RPN", some might think this is a mistake thinking it should be RPG. Others might think, because she is dressed in white and is going to extract Frank's bullet, that she has an "RN" or that it is something like "LPN" ("RPN" would be 'Registered Practical Nurse'). It is probably not a mistake. When referring to RPN and "being an artist with an RPN" they are most likely referring to a series light machine gun (Ruchnoy Pulemyot Nikonova) similar to an RPK.
When Frank Moses enters the deep file room under the CIA headquarters he kicks a hole next to the door and opens the lock from the inside. When he opens the door and is greeted by Henry there is no damage next to the door on the inside wall. This is because he doesn't kick all the way through the wall. He only kicks through to the door controls, which are INSIDE the wall.
The Plantronics hands-free headset that Sarah uses in her office has a red indicator light on the end of the microphone boom. The light is supposed to be off when the phone is not connected, flashing when the caller is on hold and constant-on when connected normally. However, every time Sarah is shown talking to Frank, the light is flashing, indicating that the phone is actually on hold.
Frank wakes up at 6:00 in the opening scene (according to the bedroom clock). It is supposed to be Christmas time. At that time of year (in the USA) it would be dark out at 6:00 (a.m. or p.m.) yet there are signs of daylight in his unlit home.
In the first two aerial shots of the hotel in "Chicago" where the Vice President is appearing, you can see the hotel sign reading "Fairmount "Chi Cago" with "Chicago" being split in half. That's because they had to cover up the real name of the hotel, the "Royal York" which is where they filmed in Toronto.
The goof items below may give away important plot points.
Frank Moses learns of the apparent death of Joe Matheson (Morgan Freeman's character) when he phones the care home, now a bustling crime scene. However there is no reason for the care home staff or police to assume that Matheson has been killed; we see later (in a flashback reveal) that he was not killed or injured, so there won't be *his* corpse present. If a corpse was left at the scene it would have been that of his would-be assassin. As far as would have been known by staff or police, Matheson was missing, with evidence suggesting a serious altercation having taken place.
When Frank kidnaps Sarah Ross and she is in the back seat her hands are tied in the front which she keeps bringing up to her chest. She can easily reach up and pull the tape across her mouth but she keeps yelling beneath the tape.