Trivia: Even though this film isn't connected to the original films, Harold Ramis, Bill Murray, Dan Akroyd, Annie Potts, Ernie Hudson and Sigourney Weaver all make cameos in this film. Harold Ramis as a bust in the hall of the university where Erin was going to teach; Bill Murray as supernatural debunker Dr. Martin Heiss who dies after Mayhem kicks him out the window; Dan Aykroyd as a cab driver; Annie Potts as the snooty hotel receptionist; Ernie Hudson as Patty's uncle who gave her the hearse to drive; Sigourney Weaver as Holtzman's mentor Rebecca Gorin.
Kevin: Can I bring my cat to work? He has terrible anxiety problems.
Abby Yates: Oh, I'd love to let you bring your cat to work, but I have a terrible cat allergy.
Kevin: I don't have a cat. He's a dog. His name is My Cat.
Abby Yates: You named your dog My Cat?
Kevin: Mike Hat.
Erin Gilbert: First name Mike, last name Hat?
Kevin: Well, his full name is Michael Hat.