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.
After the meeting with the ghost of the mansion Erin hugs Abby and she gets the ectoplasm from her, but in the next shot it disappears.
Near the end of the credits, it says,"For Harold Ramis." Harold Ramis played Egon Spengler in the original 2 Ghostbusters films. This was a tribute to him. He, unfortunately, passed away February 24, 2014.