In the scene where Tom Green has the boy hanging from a rope with a chainsaw. When the boy cuts the limb the limb hits the car, and bounces onto the ground. The camera cuts to Tom Green and Jason Lee, and then back to a shot where you can see the car and the limb is back on the trunk.
Immediately after the botched convenience store robbery, Tom Green tells Jason Lee that he has an idea to make money in the form of a "scam involving pizza delivery." This is surely a joke thrown in by Tom Green because of an attempted scam/skit on the Tom Green Show called Undercutters where he followed around pizza delivery guys with his own pizza in an attempt to undercut their price. Hilarious skit by the way.