Factual error: Metrocity appears to be located in Michigan, but the news station on the truck starts with K, which signifies that's it's in the western half of the US.
Factual error: Adam Sandler is cooking bacon on the bug zapper, laying the meat on the outside cage. That couldn't happen, since the outside of a bug zapper is not hot and has a covered protection cage to avoid shock. (The cage is what the bacon was lying on.)
Factual error: When they are watching the prince's wedding on TV, you can see the TV-channel's logo in the corner of the screen. The channel NRK didn't start using this logo until 1996, so the program is definitely a rerun, and not the original airing from 1968 which is when this film is set.
Factual error: Towards the end of the movie where they finally can get on the bus the bus scene has two mistakes. One is that it travels ilegally on the right hand side of the road at speed over some chevrons but more importantly as they are supposed to be in Tipperary, there is a bus stop sign which says "Dublin City Bus" which is a completely different bus service to the "Bus Eireann" service they get on.
Factual error: Just after the scene from "the picture frame store" with Jason Bateman and Jeff Goldbloom, there are a few shots of New York City. One of the shots features the twin towers of the old World Trade Center. (01:08:30)
Factual error: Rita says that George was a gunner in the RAF during the war. The photograph of him in uniform in his and Connie's house shows him wearing a (double wing) pilot's brevet instead of the single wing of an air gunner.
Factual error: When Phil Foster and the cabbie are trying to access the files on the flash drive, they use an Amazon Kindle. The Amazon Kindle does not have a USB connection for a flash drive.
Factual error: In the part near the end of the movie where the agents are told that they must push a kill switch to thwart Kitty Galore's satellite launch, Butch says "Look - that red button! It looks like an off switch." Butch is a dog, which means he is color blind. Doubly odd as in the first film Butch does mention that he is colorblind and cannot identify a red wire when he tries to defuse a bomb the Russian cat attached to the lab door. And yet, he claims the whole time that he's colorblind, when dogs aren't actually colorblind anyway. They only have a minor coloring difference, and they have somewhat poor eyesight.
Factual error: Farmer MacReadie tells Phil he knew of a pig that could play Scrabble. However Scrabble was not released until 1948, three years after the war ended.
Factual error: If there was that much of a famine in the pack, the Omega wolves would surely have already died of hunger.
Factual error: When Jamie Lee Curtis drops the earring down the drain, she panics and kicks the pea trap off the drain. This causes water to spew from the pipes which is possible if she accidentally kicked the water pipe but when she replaces the pea trap by hand, the water cuts off which would not happen, as the drain has nothing to do with running water.
Factual error: As Ruben gets from his colleague the newspaper with the headline about the suppression of the 'douane', you can read just by his head "Mardi 17." It's 1986 as stated, and the date the news is referring to can only be February 17, when the Single European Act was signed, producing the headline shown. But it was not a Mardi (Tuesday), but a Lundi (Monday). (00:01:50)
Factual error: Edgar's license plate is "FROG BROS", but California only permitted up to seven digits at that time. It wasn't until 2014 when eight or nine digits were permitted, but even then only in "very rare cases." (00:27:40)
Factual error: When they land back at the airport you see the door open and hear the sound of the engines. However at the rear of the left engine you see the engine cover (red flag moving in the wind) still in place. The engine cover still on while the engine is running could cause serious damage or it would be blown out. It would be removed during preparation checks.
Factual error: Bobby picks up a gas nozzle at the gas station and squirts gas at the bad guys. Gas nozzles won't activate without payment being made first.
Factual error: Sailing ships in harbor always have their sails furled and stowed, not set. All the ships in the city's harbor have their sails set. Would never happen.
Factual error: As Freddie is walking toward the house, the streetlight to the right of the shot is a modern post-top unit with a one part photocell visible on top. In the 70s in the UK it would have been a much older lantern with no photocell, as it would have been time switch controlled. (01:03:00)
Factual error: In golf scene, Kevin Spacey is supposed to be playing golf in St. Andrews. The intensity of sun and the surrounding fauna suggests they are actually playing on a course in the mid latitudes of the US. (00:11:30)
Factual error: The light switch in the dressing rooms, when John is getting ready to exit, shows a new type switch that was only brought out after 2005. The switch is by the clothes rail.