Factual error: When they are initiating the freshman girls after school in the parking lot you can see a red mid-70s Firebird with red camaro z/28 wheels that did not come out until the mid 80's. The film is set on the last day of school 1976.
Visible crew/equipment: During the grab and go stop Pickford, Don, Pink and Mitch are in the GTO. Pickford is the first to climb out of the car, If you look closely you can see he crew in the reflection of the door. This happens not once but twice when Don and Mitch return with the beer.
Continuity mistake: In the hazing scene when school is out, Joey Lauren Adams says, "Welcome to high school honey", and then pours a bag of flour all over a girl, but when it shows the girl barely any powder falls down on her.
Continuity mistake: When the girls are hazing the freshman and they're talking to Don, the first take his legs are up and crossed, then the next take they're down and crossed, then up, then down, and this goes on the entire scene.
Visible crew/equipment: During the conversation about the dream where the guy is making love to a woman with the head of Abe Lincoln, the reflection of the boom mike can be seen in the top part of the classroom door.
Factual error: As the girls are being hazed, the girl giving the orders is shown from the front and in the distance behind her are a red and white mid-1980s Chevy S10 Blazer, a white '90s VW Jetta, tho the events of the film occur in 1976. There's also a Pier One billboard in the background. Pier One wasn't incorporated until 1986.
Continuity mistake: While they're driving around town talking about college, you see the three guys in the back seat, the camera goes to another angle, then a few seconds later, you see them in the back seat again, but the guys have switched places.
Factual error: During one of the scenes, you see a guy on a motorcycle wearing a Misfits jacket. The movie takes place in '76, but the Misfits didn't form until '77.
Factual error: When Cynthia, Mike and Tony are driving to the Top Notch, there is a very clear shot of a billboard alongside the road. It advertises PCA, an HMO for employees of the State of Texas which only existed from the mid-1980's until 1992. (The film, of course, is set in 1976.)
Continuity mistake: Second, they are in the back of Pink's El Camino, but he rode with Wooderson. Pickford didn't drive it; he had his GTO.
Continuity mistake: After Carl's mom pulls a shotgun on O'Bannion, his paddle is showing the "F AH Q" side. In the next shot, it is reversed showing the "Badass" side.
Visible crew/equipment: In the scene where O'Bannion gets the paint dumped on him by the freshmen, you can see a boom in the bottom of the shot between the kids legs.
Continuity mistake: In the scene at the end of the movie when they are driving to buy the tickets Slate is smoking a joint and blowing smoke rings in the back seat. However, in the next shot the window is down and Pink's girlfriend's hair is blowing everywhere and he is still smoking. How could he blow perfect smoke rings with all the wind?
Continuity mistake: Throughout the movie, Pink's car held the Kiss-face-painted statues (during the intro when it was still covered/when everyone saw it over at the Emporium/when they were on the highway on their way to the beer bust), except for the scene when he dropped off Mitch after his baseball game which was prior to the scene at the Emporium. Only Benny had the other pick-up among them (and I wouldn't include Darla's) and his was occupied the whole time.
Revealing mistake: When O'Bannion got paint dumped on him, he went to the curb to break his paddle. There is already visible white paint on the curb in the shape of the paddle prior to him slamming his paddle into the curb.