Tom Green performed most of his own stunts, including the skate boarding scenes and the house scene. The studio was against him doing any of the stunts because if anything happened to him, they'd lose the lead actor AND director.
Derek Harvie, co-writer of the film and writer for_The Tom Green Show (1999) (TV Series)_, can be seen eating lunch near the boss of the animation company. Other friends of Green can also be found in the same scene.
The whole idea of the "cheese sandwiches" is from a sketch on _The Tom Green Show (1999) (TV Series)_, when he met an old couple in the park and acted really nice to them and asked them for a cheese sandwich that they were eating. After he walked away from them, he started talking to the camera saying "Who the hell eats cheese sandwiches?, I mean there's salads and meat? Cheese sandwiches!"