Revealing mistakes: In the flashback where young Seth draws penises for amusements, the close-up views of the drawing hand is an adult's hand rather than the pre-teen's hand.
Continuity: Seth has period blood on his jeans, but when the officers confront him after the party, the stain is gone. It reappears later, when he gets to the next party.
Continuity: When Seth arrives at Becca's party, the same verse of the Roots "Here I Come" plays twice.
Continuity: In the scene where Seth is holding the detergent bottles and arguing with Evan, you can clearly see that the dent on the front of the detergent bottle in his left hand keeps mysteriously disappearing and reappearing.
Continuity: When McLovin is punched in the liquor store, his wound is on the side of his face under the stem of his glasses. Later, the wound appears on the front of his cheek.
Continuity: When Evan and Seth are first looking at Fogell's fake ID, you can clearly see that there is no black magnetic strip on the back. When the police are looking at it in the liquor store the magnetic strip is visible.
Continuity: On their way to the bar, the cops run the same red light (James St) twice in succession.
Continuity: When Evan and Seth are in the store near the start of the film, you can see outside it appears to be getting dark with car and street lights on. However when the boys enter and exit the store it is sunny.
Revealing mistakes: When Seth is running through backyards with the laundry detergent bottle supposedly full of beer, it is obviously empty, such as when he throws it over the fence.
Continuity: At the very first shot of of the opening scene where you see Seth driving in his car and using his mobile phone, his seat-belt is twisted at least once. In the next close-up shot and the following wide shots, the seat-belt, however, is not twisted anymore.
Continuity: When Evan and Seth are talking to the creepy nerd guy outside the liquor store after Seth gets hit by the nerd's car, the "open" sign behind the nerd guy can clearly be seen changed from off to on from shot to shot.
Continuity: After Seth gets hit by the car in front of the liquor store, when the driver of the car pulls out his wallet and offers them money, the wallet goes from being in his left hand to being in his right pocket and back again between shots.
Continuity: In the scene where Seth is hit by the cops, the cops yell at Seth and Evan to lay down in the street. When the camera is filming them from the side you see that their legs are crossed over each other's, but when they are filmed from the front their legs are touching but not crossed. They switched back an forth between crossed and uncrossed throughout the scene.
Continuity: The policemen and intercom lady say the policemen are driving car 98, but the numbers on the car are 96.
Continuity: As Seth and Evan leave Fogell at the liquor store to talk, the white sedan parked behind them disappears instantaneously between camera switches.
Continuity: When Seth and Evan are at lunch, the red chair at the end of their table disappears and reappears between shots.
Personale o equipaggiamento visibile: During the scene where Evan is unintentionally cursing Becca over the phone, a boom mic's shadow is visible on the asphalt behind him.
Continuity: After Seth dances with the period blood girl, she goes away and he tries to stash a bottle in his pocket. When he goes to put the bottle in the pocket, we see the blood stain is not on his pants yet.
Errors made by characters (possibly deliberate errors by the filmmakers): When Evan is playing video games he comments on the use of an M16 assault rifle. The games he's playing is 'The Getaway: Black Monday', a British police game where M16s are not used.
Errori geografici: In the scene outside of the grocery store where Fogle works, the license plates on the fronts of the cars are California plates. The license plates on the back of the cars, on the buses, and other vehicles are not from any state and don't have a state name on them.
Continuity: Clark Duke appears first at Jule's party when Seth enters with the liqour, walking behind Seth, and in the very next shot, he is in the backyard gazebo where Becca is waiting for Evan.
Continuity: Just before Officer Slater hands Fogell the gun in the car, the camera shot shows him dropping the magazine and handling the gun with the slide open. However when the angle changes the gun is being handled with the slide closed.