When Eugene holds up the shirt in the car after leaving the gas station, he is still in his hospital gown. Seconds later, when he asks about going to a motel, he is wearing the shirt.
When Rick is about to chop Tucker's head his foot switches positions between shots.
When Eugene talks to Cindy in the tree outside her bedroom window, it is supposed to be night, but blue sky appears through the tree leaves.
Eugene gets his hospital gown wet with diesel fuel at the gas station. As Tucker returns with spare clothes, Eugene has the wet gown just covering his private parts, Tucker asking: "Why are your clothes all wet, man?".
As they drive on, Eugene balks at the somewhat feminine clothes Tucker brought while he has the supposedly soaked gown back on.
As they drive on, Eugene balks at the somewhat feminine clothes Tucker brought while he has the supposedly soaked gown back on.
All of the cars have front and rear license plates. South Carolina only requires a rear license plate.
Eugene refuels the car with diesel fuel. DIESEL is written clearly above the nozzle. Vehicles that run on unleaded gasoline will not run on diesel.
There is a scene where Tucker has to dodge a car that he almost hits while driving, however, before and after the dodge, the headlights of a car driving behind them are seen in the background, but when he dodges the car in front of him, the headlights on the background don't move.
When Tucker lights up the pipe, we see a little burning piece of ash float to the curtains in the back, and light them up. However, there are three mistakes. First, the little burning ash turns off right before touching the curtains, second, the fire comes from below, instead of coming from where the ash supposedly touches the curtain, and third, a curtain could not be lit up in that way, and that fast by a little burning ash, unless it had some fuel poured to it previously.
When the guys are still young, when it says three weeks later, one of them plays with a Nintendo Game Boy Advance SP, which was not on the market 14 years ago.
In the opening of the movie, when the guys are young, there is a Camelback on the wall in the brother's room. The Army pattern on the Camelback is the ACU pattern that wasn't in use during that time period. The Army adopted that pattern universally in 2005.
When Eugene and his girlfriend are giving the speech to the children about sex, we see her lips say "retard" but hear "crackhead".
The real Playboy Mansion is not off a main road nor is there a foot-bridge at the main entrance, as shown in the film. It is on a hill: a gated road leads to a circular driveway, which encircles a water fountain.
South Carolina has no Jefferson County.