Character mistake: In the 11/14/2005 US Army Rangers report about Peter MacLeish, the word captain right under MacLeish's signature is misspelled "captian."
Continuity mistake: When Agent Wells drives the van filled with bombs out of the parking structure both back doors of the van are open revealing the bombs, in the next shot both doors are closed.
Continuity mistake: Agent Wells is chasing the bad guy on foot. In the first shot her SIG is not cocked. In the next shot it is cocked. In the next shot the slide is retracted. In the next shot she somehow magically fires it. Then the hammer is somehow forward again. A few seconds later as she climbs the stairs it supernaturally transforms into a Glock. And at no time does she use a proper grip on the gun.
Other mistake: When Agent Wells tells the White House they need to alert the Pentagon that Lozano is inside the Pentagon, she is told "it's already done, they are locking down the building right now." Then, later in the same episode, we see Lozano use a key card to easily pass through the building. (00:15:45 - 00:21:15)
Factual error: When in Amsterdam, there are a number of mistakes with Hanna's car. First off, it's a brand new model, but it has a numberplate from a series six years ago. Second, that numberplate is a flat sticker, while Dutch numberplates are made with very thick plastic letters. Third, the registration is 87-UYM-3, which wouldn't be used, given that Dutch numberplates don't use vowels.
The Mission - S1-E5
Continuity mistake: At the end of the episode the undamaged Capitol building is visible in the background, despite being destroyed in the first episode. (00:39:13)
Continuity mistake: Agent Wells is wearing high heel shoes when she gets kidnapped and wakes up on the ship in S1:E19. In S1:E20 she is wearing low heels when she tries to escape on the ship. In S1:E21 she is again wearing high heels when she drives away from the FBI building.
Character mistake: President Kirkman calls a soldier a Corporal when she's wearing the rank of Specialist. Next, he calls a soldier Private when he is also wearing the rank of Specialist. (00:04:46)
Continuity mistake: Hannah leaves the house in a Ford Fusion. In the next scene she is on the highway in a Toyota Camry. (00:26:50 - 00:27:50)
Continuity mistake: They are taking an oath from the capital building steps that should still be in rubble.
Suggested correction: It's stated that the Capitol is being rebuilt, this is not an error.
Continuity mistake: When Lorenzo gets in his car after he was in the Pentagon, he has his silver case. When Agent catches up with him, and he gets out of his car, there is no briefcase, even when she looks inside the car. What happened to it?
Continuity mistake: When Hannah Wells and Jason Atwood confront Brooke Mathison and she tries to fight back with her hidden pistol, Jason fires three shots at her, while Hannah fires two shots at her. However when they show Brooke Mathison again, only one shot is visible on her body. Because she was facing Jason, there should have been at least the three shots he fired at her visible. (00:39:53)
Other mistake: There is a shot of the NIH building. The lintel says The National Institutes of Health, the correct name. Cut to a shot supposedly inside the building, where a wall hanging says National Institute of Health. So does a brochure given to an actor. (00:17:00)
Character mistake: The chessboard on the desk part way into the episode is set up wrong. Any chess player knows the "white on right" mantra for the white square being in the right corner of the board. In the show the entire board is off and black is in the lower right corner. (00:11:20)
Continuity mistake: When the FBI agent is chasing down "Catalan", after crashing his car, suddenly in one shot the slide of her pistol is retracted, as if the gun is empty. Previous shots it is closed and ready to fire. Then right after showing it retracted and locked back, the very next clip she fires her gun, without doing anything about the slide.
Continuity mistake: When Tom Kirkman visited the man who killed his wife in prison in S2E10, he sat down for the conversation. In this episode, when the surveillance video of him leaks, it shows him having the conversation whilst standing.
Character mistake: The ‘Brit', Damien from Scotland Yard, and Emily are outside the archive facility - Damien pronounces ‘route' the American way (rowt, rather than root).
Continuity mistake: When Hannah reads the email about The Traitor she has blood on her face, when she arrests Whitaker she is clean and when she remembers the past she has blood on her face again.
Factual error: FBI Agent Hannah Wells pulls up to the house of the First Lady's mother driving a unmarked police vehicle with government license plates. The license plate is I410918, which is a Department of Interior plated vehicle. The FBI wouldn't be driving a Department of Interior vehicle as the FBI is in the Department of Justice. A Justice plate would have a J and a FBI agent vehicle would have a regular license plate. (00:14:00)
Factual error: The dirty bomb went off at the Brandt Metro station. There is no station with that name.