When Ace gets in the club to meet that guy with the long blond hair and the glasses, the death metal band that is playing is Cannibal Corpse and the song is called "Hammer Smashed Face". Jim Carrey is actually a fan of Cannibal Corpse and he insisted on them appearing in the movie since the movie takes place in Florida which is the "capital" of death metal.
All the outdoor scenes at Camp's party and the asylum were filmed at the Vizcaya estate in Miami. Watch 'Any Given Sunday' and you'll see much of the same estate.
The mental institution that Ace and Melissa go to, where Ray Finkle was hospitalised, is called Shady Acres, which is also the name of director Tom Shadyac's production company.
A note, found in Lt. Einhorn's desk, is dated January 17, which is also Jim Carrey's birthday.