Other mistake: At the start of the film where Detective Dooley and Jerry-Lee are getting ready for work, we see Dooley climbing out of the shower, but in the reflection in the mirror behind him, we see him emerging and can clearly see his under-pants which are bone-dry. (00:00:32)
Continuity mistake: Near the end at the police station, Devon Lang walks straight into the grounds of the station (which he would never be allowed to do) then he just knocks on a fire door and someone answers. Wouldn't the cop find it a bit odd that someone is knocking on the fire door, and then the cop actually opens the door not seeming to be suspicious at all.
Deliberate mistake: When Dooley looks at the photo of himself, Jerry Lee and his wife Tracey, it's obviously a still shot from the first movie, as the angle the picture is taken from was obviously not taken by anyone else as they were the only two in the apartment with Jerry Lee at the time. (01:11:40)