Continuity mistake: Dennis walks up to the computer to see the guy claiming to be their father carrying nothing, he puts his empty left hand on the bar, but when the shot switches he is holding a coffee in that hand. In the shot right before the opening credits the coffee is gone again. (00:01:00)
Continuity mistake: When Frank, Charlie, and Dennis are in the cop car at the red light, they're on a one-way street, with cars parked to their left (facing the same direction as the cop car). However, when it cuts to Frank, we see a car drive by in the opposite direction, and the parked cars are gone.
Continuity mistake: While Mac is holding the picture of himself to Dennis & Dee, towards the end of the scene he is holding the picture with one finger around the middle on the top edge. Dennis then says "You're going to hell". The next shot he is holding the picture by its side with two fingers.
Continuity mistake: At the very end, while the gang is reading the new review and then talking about how their names weren't mentioned, a hammer appears on the bar between them, only to disappear a few shots from the end; Charlie then retrieves it from under the bar as they leave.
Continuity mistake: When Dee is standing up she is smoking a cigarette with her right hand. When the shot comes back to her as she cuts Charlie's joke off, the cigarette has disappeared and the bottle of whiskey has left the table and is in her right hand. (00:01:15)
Continuity mistake: When Dee tells the gang someone is contacting her claiming to be their dad, only one coffee cup is next to Dee, on the side closest to Mac. She lifts that cup and puts it towards her lap, but when the camera shows the computer, the cup is back and another cup is on the other side of the computer. When the camera zooms out both cups are gone again. (00:00:30)
Continuity mistake: When Mac is sitting in the back of the cop car and the black cop is talking about how people don't take kindly to being called a nerd, there is a red car driving up behind them. When the camera pans out it has become a white SUV. (00:21:40)
Continuity mistake: In the scene when the gang opens the trunk to reveal the first kidnap victim, Sweet D is wearing black nail polish. The next scene in the apartment her nails are not black anymore. Then in the next trunk scene with the second victim they are black again.