Trivia: At the end of the movie, the trailer truck is delivering Down Home spring water, in reference to a company who produced the movie, Down Home entertainment.
Trivia: After the boy in the green baseball cap gets bitten by Dennis for the 1st time, he tells his father "To make a sign or something." Later, in the "Pancakes" scene, look by the swing and you'll see a sign that says "Do Not Sit Next To Dennis."
Trivia: The original dog hired to play the mad dog in the film was elderly and reportedly so friendly that it couldn't be made to seem the least bit threatening during filming. The producers were forced to find a replacement dog at late notice. The one they found (the one seen in the film) was just the opposite. He was so vicious that none of the cast or crew were able to go near him and great precautions had to be taken while his scenes were being filmed to assure everybody's safety.
Trivia: The director planned the "no condom" sex scene to be filmed with complete nudity, but Cerina Vincent, who had only recently done a great deal of gratuitous nudity in "Not Another Teen Movie" was worried about being associated too heavily with nude scenes so she refused to let her ass be shown. The director really wanted to preserve the nudity, though and so he eventually persuaded her to show precisely 1 inch of her ass in the scene. He personally measured the exposed area of her ass with a ruler to make sure he got the agreed upon inch, then the bed sheet was duct taped to her buttocks in this position to make sure the sheet didn't move and violate the agreement in either the director or Cerina Vincent's favor. This is why the bed sheet seems to be stuck to her ass in that scene - it is!
Trivia: The crew member responsible for transporting the "Bert's decapitated body" prop decided that the best way of doing this was to strap it in to the passenger seat of his truck. Unfortunately, he was spotted by a highway patrol car while doing this and ended up being held at gunpoint by the cops, who believed the crewman was a murderer trying to dump his victim's body. The crewman was let go peacefully after the cops realized that the "body" was just a movie prop.