Factual error: When the younger Brenner and Cooper are at the arcade, one of the games shown being played is Q*bert. Q*bert wasn't first released in the US until October 1982 and at the end of the scene, Cooper shows Brenner a paper for an upcoming arcade game championships dated July 26th 1982.
Revealing mistake: In the London scene, when the main characters prepare for the Centipede attack (the scene with the football players) there is a grey Land Rover which has a fake UK number plate on it. Plus since the film was filmed in Canada, the car also has left hand drive windscreen wipers.
Revealing mistake: When Brenner and Cooper are at a bar, they are watching a news report of Cooper at a school reading to a group of children. There are a couple of times in the report that show a shot of the children, but whenever the shot is on Cooper, there are no cameras in sight that would be used to film the shots of the children, revealing that the shots of Cooper and the shots of the children were filmed separately.
Continuity mistake: When Van Patten is talking to Admiral Porter about the light cannons not being tested, she's holding her clipboard up and a pen is between her fingers. When the scene changes angles the pen is now attached to the clipboard and there's an extra piece of paper in front, then when Admiral Porter turns and walks away, the pen and paper are gone again.
Factual error: As the camera pans across the room to where Cooper is playing The Claw you can see the arcade game Burger Time being played in the background. The game flyer shows the date as July 26th 1982. Burger Time was not released until August 31st. (00:03:35)
Factual error: When Sam and Will walk into the venue hosting the 1982 Worldwide Vieo Arcade Championship you can see some kids playing on a Zaxxon machine. Zaxxon was released in December, 1982.
Character mistake: Lt Col Van Patten's ribbons are out of order.
Other mistake: When Matty and Sam are having a conversation about modern games vs older games, Matty is playing a game on a Playstation 4 but the controller isn't on.