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.
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.
Continuity mistake: Benny's pickup truck has capless slotted mag wheels, all four the same size. In two shots when the freshmen chase the seniors, Benny's pickup cuts across a lawn and panic stops in front of Carl's house, the truck has center caps on the wheels and the rear wheels appear to be a bit wider.
Continuity mistake: When O'Bannion gets paint dropped on him, it falls only on the left side of his head and body, but as he walks away he is covered in it.
Continuity mistake: After the paint's poured on O'Bannion, he pushes Mitch and puts his hand on his car as he opens the door, but he leaves no paint on it.
Continuity mistake: In the scene where the seniors are at the baseball game waiting for Mitch, Pink is stopped by an older man who asks him if "this arm is ready", for football. It is clear that the man grabs his left arm when asking him. But later in the movie, when they are on the football field, Pink throws the no drug use form and it is clear that he throws with his right arm.
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.
Continuity mistake: In the scene when they are initiating the freshmen girls, one of the freshmen is taken over to Dawson and she is told to propose to him. When she says, "Anything you want." she is kneeling. Then it shows Dawson telling her to make an O with her lips and when it goes back to her doing that she is sitting on the ground.
Continuity mistake: In the scene in which Matthew McConaughey is wearing a frilled lace mock polyester shirt, while offering his profound theory upon living, you can see the bulge of cigarettes, in his upper left pocket, a moment later, they're gone.. then when the camera angle reappears on him, they're back.