Factual error: As Eliott walks across the hillside where the concert is taking place, you can see nylon dome and bivouac style tents. Tents made with metal poles and nylons didn't come to market til the 70s. (01:23:05)
Factual error: When we first see Rat, he's noticeably taller than Mr. Fox in a close-up. Shouldn't it be the other way around?
Factual error: The large revolver used by Black Dynamite throughout the film appears to be a Smith & Wesson Model 629 Classic. The movie is set in the early 1970s, but this gun was not produced until 1990.
Factual error: The lead song, "Lollipop," wasn't written until 1958, seven years beyond the chronological order of the movie.
Factual error: When Dr. Marshall and team launch the tank of nitrogen into the mouth of the dinosaur, there's absolutely no reason why the tank would explode as it was swallowed whole and didn't experience any sort of impact that could have punctured, ruptured or broken the valve off the tank.
Factual error: Kevin and his buddies go to graduation in Army dress. While the ribbons displayed are hard to identify, several things are sure. They don't have a Washington National Guard ribbon, so they're regulars, and they have no Middle East service ribbons. So just where did they acquire so much fruit salad?
Factual error: Leo says he smells potato, but he is in a space suit and in space, making it impossible for him to smell it. (00:33:00)
Factual error: Near the end, no one in the hall realizes that a real diamond cannot be destroyed by a bullet. Also, even if it was a fake, it couldn't be blown to smithereens with a single gunshot.
Factual error: When the Lincoln Continental Convertible was rolling backwards down the hill, Nick put his hands on the trunk to try to stop it. A car, especially one weighing 5,000 - 6,000 #, would easily knock over a person and possibly cause serious bodily injury (even death). Nick's attempt to stop the car by holding onto the driver's door handle would also be futile and potentially dangerous. (00:37:47)
Factual error: About 30 minutes from the end, the rodeo parking lot is shown, with the cars parked 3 deep (i.e., 3 cars parked nose-to-tail). Valet parking? At a Wyoming rodeo?
Factual error: At 01:29:08 we see Carys lying despondent on the couch in her living room surrounded by balled up tissues, empty food containers/soda cans and trash - all the signs of going through a bad break up. She gets up to answer the door for her mom, who has brought by a plate of cookies. Carys sits on the couch again, looks down, looks up, and by 1:29:40 the entire room is clean; we see her mom fluffing a pillow. There is no way her mom could have cleaned the living room in less than 32 seconds.
Factual error: In the beginning during the gas station scene, the timeframe of the movie is supposed to be Sept 2003 but a number of late model (>2006) Ford, Subaru and Honda vehicles are seen driving by in the background.
Factual error: When Ben goes to Anna's yoga class, we see the very end of the class. Everyone is seated upright, cross-legged. In real life, yoga classes always end in savasanah, a pose where you lie on your back and breathe to take in all that the body/mind just did. They just had the actors seated upright to show them making eyes at each other.