Factual error: The movie takes place in Connecticut from 1961-1986. All the cars in the movie have license plates on their front bumpers, but Connecticut didn't require front plates until just a few years ago (late 90s-early 00s).
Factual error: We know that Elle and Warner are both in Callahan's class together, but that Warner is not in Stromwell's class with Elle. However, Harvard, like most law schools, divides its first year class into sections that take every class together. Warner should either be in all of the same classes as Elle or none of them.
Factual error: The horn on the LT's Range Rover is at the end of the signal lever not in the middle of the steering wheel as shown.
Factual error: Burt claims his watch updates its time "by connecting directly to the cesium clock in Colorado via ultrasonic frequency." Later the graboids home in on him by the ultrasonic sound emitted by his watch. Firstly, radio controlled watches update their time by receiving signals, but they don't emit any signals - the battery would be way too weak for two-way communication. Secondly, they work on radio waves, not sonic waves. Thirdly, if a hypothetical time transmitter did work on ultrasonics, the smallest distance between Colorado and Nevada is some 435 km (around 270 mi). An ultrasonic signal strong enough to reach that far would probably be deadly within a sizable range around the transmitter. (00:08:20)
Factual error: At the end when Joe, Brandy, Clem and Charlene, the alligator woman are in Joe's 1967 Plymouth GTX, Robby claims his car is faster. Charlene chides back about his Trans Am, saying 'you think you can match that little old slant six against his 426 Hemi?" Pontiac Trans-Am's did not come with slant sixes, a Dodge motor. His was obviously a V-8, and would have most likely have been a 400, but we get the 'yours is really small' reference.
Factual error: When Judith wakes up chained to the engine block she notices the Sony camera on a pole. The guys are presumably watching her through that camera. The problem is that there are no cables running from that camera to provide the video feed to the TV. Sony cameras always have the video output connections on the front right hand side. There are no cables attached to this camera. (00:35:40)
Factual error: When Pootie is leaving Biggie Shorty's house, he says he is going away. Biggie Shorty asks where, to which Pootie replies he doesn't know. Biggie Shorty says that she has a home in the country and Pootie can stay there. (She even says South Carolina I think). Later in the movie after Pootie has gone to the country home, in the scene where the Sheriff introduces Pootie to his daughter, you can clearly see a NJ Turnpike sticker in the store window behind the Sheriff. The NJ Turnpike does not run through South Carolina, it is in New Jersey.
Factual error: When the janitor is washing Crazy Legs' car, why would he leave the window open?
Factual error: When Corky is trying to get into his family's underground casino and is being worked by the wrestler girl and the "little person", his wallet falls out. The little guy picks it up and looks at his license. The next shot shows you the license is from Florida and this license number starts with an "L". That is incorrect because in Florida your license number always starts with the first letter of your last name. In Corky's case the letter "R".
Factual error: The zip code Henry gives Beth to Augusta (04139) is not a zip code.
Factual error: In the scene when Jim goes to band camp to look for Michelle, all the flute players (including Michelle) don't know how to play flute, they aren't moving their fingers to match the speed of the music. (00:26:55)
Factual error: The beehive is a large part of this story for Archie wants to get it down for Ava. But bees do not make hives like that. The type of hive that they show is similar to a wasp's. (01:02:35)
Factual error: The bank Steve Coogan wants to rob is in Manchester. When he sees the bank for the first time, we see a CMT bus drive past behind him. CMT buses operate in Liverpool, not Manchester.
Factual error: At the beginning, after the blue virus-monster appears, some telephone wires wrap around a scientist's arm. There aren't that many wires in in a normal telephone, nor are they that thick.
Factual error: When Hal meets Rosie's mom, she is a large woman but her hands are skinny. If someone is the size as her character, they would have large hands as well.
Suggested correction: Actually when Hal first meets Rosemary's Mom, she is shown skinny as does Rosemary through the way that Hal sees them. It's not until later in the movie after Hal's hypnosis is gone do we (and Hal) see the "real" fat mom and rosemary and their hands do look a bit larger by then.
It is obvious that Rosemary and her mother are wearing 'fat' suits as neither women are large in real life. The suggested correction in invalid as throughout the movie, the only time Rosemary's hands appear large are in spots. (eating the taffy apple when she met Jill, and rubbing Hal's cheek when he had the goop on his eyes. Yet you never see the full body with a face in those shots.) Therefore, as I stated in the factual error, when Hal meets Rosie's mom at the end (at the party), she is wearing a fat suit, but her hands and Rosie's are skinny. It's a valid movie error.
Factual error: At the end of the film when the news reporter says 'Isn't that the guy who had the skunk on the freeway?' then you hear a voice calling him back to look at the camera. This is wrong, as if they wanted his attention on the camera, then they would call him through his headset.
Factual error: There's not enough soda in two cans to soak two ninjas.
Factual error: The movie takes place in Chicago, where the police wear distinctive checkerboard bands on their caps. However, none of the officers shown in the flick wear these bands.
Factual error: The newspaper pictures are too glossy to be newsprint.
Factual error: The whole "new cow" theory is completely false. Any farmer or anyone with common sense knows this is not true. A bull will mate with any cow in heat, whether he has been with her before or not. The entire movie is based on a sham.