mentioned in the beginning by one of the characters
The scene at the end in which the bullfrog infestation is seen at a larger scale with synthesizer music playing is a reference to said film.
Mason describes the film
listed in end credits
Included in a $300 question
"How about Frogs? Wait, there's already a Frogs movie?"
This film uses some stock footage from said film.
This film's theatrical trailer is featured.