Goofs

When the Watanabe's are explaining to Patty why they are breaking the lease, movers are taking furniture out of the front door of the house. However, a previous shot of the front of the house showed no moving truck, or any car, out in front.

Patty's last name is shown to be "Palmer" on her financial statement seen in Carter's briefcase, but the closing credits list her name as "Patty Parker"

When Patty is looking for the cat in the basement, the pigeon flies out of the window and the long haired cat appears. In the close up shot of the cat shrieking, it is a short haired cat. In the shot of the cat exiting through the window, it has changed back to a long haired cat.

Carter's briefcase when Patty is sneaking through his room.

The policeman quotes an entirely non-factual law to Drake about a tenant having rights just because a tenant physically enters a building, even at the time the movie was made. No tenant has any legal right to remain on the premises of a single-family or multiple-family dwelling in any state without payment, and furthermore, because of Carter Hayes destructive acts (e.g., releasing the cockroaches and physical damage to the unit), Drake had more than enough good cause to have Carter forcibly evicted, either by the City of San Francisco police or the San Francisco County sheriff.

Carter Hayes would have come under immediate suspicion by the police for reporting the fight with Drake fifteen minutes before it actually happened.

When Carter Hayes is making excessive noise in the late night/early morning, Drake Goodman could have also called the police to come and write a citation. This would have resulted in a police investigation as to who Carter Hayes really was.

The cockroaches in the Watanabe apartment are not German roaches; they are about four or five times too big. They look much more like Palmetto roaches, which are endemic to the Southeast US/ Gulf of Mexico area.

Obvious stunt double used for Carter Hayes during the first shot of him and Drake crashing through the window of the front door.

The movie oversimplifies how easily one can stage a self-defense shooting by having Hayes shoot Drake and put a crowbar in his hands. The mere fact that Drake was shot on the stairs by Hayes, who was entering the building from outside would bring suspicion upon Hayes, especially since Hayes was known to rarely ever leave his apartment.

When Patty tries to stop Drake from smashing Carter's car in the garage, she pushes him back and begins hitting him in the stomach, preventing him from actually striking the car. However, the sound effect used for each of Patty's hits sounds like one that would be used for, ironically, the hood of a car being smashed. Clearly an intended sound effect for the scene was simply misplaced.

During the shot of Patty and Drake going upstairs in the final scene, the camera moves from inside to the outside and the camera is reflected in the window during the shot.

Hayes continues his harassment by calling the police and provokes Drake into assaulting him. When the police come and sees Hayes injured, they take Drake away immediately without asking any questions or investigating. No law authorities would ever take away someone with mere assumptions or without investigating, regardless of a history of Drake trying to force Hayes out by shutting off the utilities. Completely unrealistic.

When Hayes requested that Drake waive the credit check, that should have been an immediate red flag.

They refer to the apartment they rent to Carter as a ground level apartment, but it's on the same level as nearby second-floor apartments seen through the windows.