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
A character has a poster for this on their bedroom wall.
Chevy Chase introduces a clip from his new movie