Funny Farm (1988)
When the main characters are downtown, a movie marquee displays "Funny Farm with Chevy Chase"
Video case is shown in a video store.
Buffy tells Kendra to watch the in flight movie unless 'it stars Chevy Chase and a dog'. Sarah Michelle Gellar had a small part in this movie
In the town of Modoc when going to Rose's Bed and Breakfast, one can enter into the brahmin fry eating contest. Right at breaking the record, it is learned that the brahmin fries are actually brahmin testicles.
A character has a poster for this on their bedroom wall.
Chevy Chase introduces a clip from his new movie