Brendan Fraser has a cameo as Link, his character from Encino Man (1992), which also starred Pauly Shore. Crawl (Shore) sees Link at a party dressed as he appeared in the last scene of the movie, and says "cool costume". Link eats a plastic frog and walks away as Crawl mouths the words "was that...?", implying that Link and Crawl had met before.
In the scene towards the end right after Travis leaves, Zack is holding up his right fist and making hand gestures after Tracy sits down next to him. The camera cuts to a different area of the room, but when it goes back to Zack, he is making the hand gestures with his left fist instead.
When Crawl is caught in the barn and chases Rebecca into the house, Mrs. Warren hasn't started cooking the turkey yet. Crawl then leaves and is picked up by Tracy and shortly after that, Mrs. Warren is serving the turkey.
When Crawl arrives in South Dakota and is chasing the chickens, he almost runs into the pen where the bull is. When he encounters the bull, a wire can be seen pulling on the bull's horns to make his head move.