References the movie Psycho (1960) when Piper is hiding in the shower, even stating she is hiding from Psychos in the shower.
The movie where Billy comes out of, is the same movie Phoebe is watching in the episode "Sense and Sense Ability". Where she is turning the television up. The movie was also used in the episode "Bride And Gloom".
Phoebe identifies "Kill It Before It Dies" as her favorite movie.
Leo says the demon is in San Francisco to make it his treat. This is a play on the Rice a Roni commercial tag line, "the San Francisco treat"
Shannen Doherty, Greg Vaughn and Chris Payne Gilbert appeared in Beverly Hills 90210 (1990) but not in the same episodes. Shannen Doherty was a main character until the end of season 4. While Greg Vaughn and Chris Payne Gilbert were guest stars in the later seasons. Both played the love interests of Tori Spelling.