Continuity mistake: The cat/pet door in Sonny's house looks worn (dirty and has paint chips), but in better condition (newer/cleaner and "boxier") when the cat ("Monster") is being pulled through. (01:17:52)
Continuity mistake: In the opening scene, there are spectators and the camera zooms in on a man and woman with a Rottweiler standing next to the woman. There is a glimpse of two people past the dog. The camera briefly shifts to show a woman (Sonny) walking toward the front door, then returns to the spectators. The Rottweiler (presumably the same dog) is now standing near the left side of a different man (and is not next to the woman). (00:02:02)
Character mistake: A detective (Briggs?) told Sonny, " that I was stupid enough to believe your dark fantasy NINE-ELEVEN call." [emphasis added] An American law enforcement officer, in particular, should know and use "nine-one-one" (911) when referring to the nationwide emergency telephone number. "Nine-eleven" (written 9/11 and NOT 911) is used to refer to the September eleventh (9/11/01) terrorist attacks in the U.S. (01:15:57)
Other mistake: In the hospital, Barrett had his right arm in a sling and his lower left leg in a cast. When the police/ detectives were trying to find Barrett, one detective said Barrett could not have driven himself somewhere because he had "a cast on his leg." The cast was on the left leg, so Barrett could have driven using his right leg, as usual. Maybe he couldn't have driven with a cast on his right arm, but the detective gave the wrong location of the leg cast. (00:50:30 - 01:13:45)
Other mistake: The initial view of Barrett's hospital room shows the lower portion of an IV pole. Barely visible IV tubes are hanging down, alongside (or touching) the pole. After briefly shifting to Sonny, there is suddenly a full IV drip bag. The IV tubes are no longer flush with the IV pole - they stick out on both sides and loop at the bottom. Also, the IV drip is not connected to Barrett. (00:50:29)
