When The Bousche is getting into his rubber suit, he is shown with his head through the neck hole, then moments later is seen struggling to get his head through the neck hole.
When Darren Criss' character is filming the family get into the limo at the end of the film, you can see his phone's screen and tell that he isn't actually recording anyone.
The Porsche that Imogene rear-ends has a 2012 registration sticker on the license plate. NJ stopped requiring registration stickers in 2004.
There is a scene of pumping gas in New Jersey, but in New Jersey there are no self-serve gas stations.
Ocean City lies at sea level, so no buildings can have basements, unlike Imogene's home.
When Imogene is at the ER, the psychiatrist threatens to write a 5150 involuntary hold for 72 hours. This legal code is only used in California, not New York. In New York, 9.40 is the legal code that permits an individual to be held involuntarily for up to 72 hours for an emergency/CPEP admission.
Several of the vehicles, including a police cruiser, do not have license plates on the front of the vehicle. New Jersey requires plates on both the front and rear of vehicle.
When Imogene rear-ends the Porsche, the store in the background has a "718" area code, indicating they are in New York, not New Jersey.