Cop Larry's head wound switches sides several times during the film's climactic showdown.
At the end, the flashing red light on the police car turns itself off as dawn breaks.
You can see the truck of the young thugs pass two times in front of the same restaurant.
Hull House is once again the setting. However, the house and the property in this movie do not resemble Hull House from the first two movies at all.
The shadow of the camera can be seen on the police officer's car when he pulls into Hull House at the beginning of the movie.
When Angela seduces Orson, a crew member is visible in the picture behind Orson.
It's never explained why Orson points the gun at the others.
Towards the end, the cop tells Nick and Holly they were not caught on the surveillance cameras at the Quick Mart, so they could just go on home. However, this is highly illogical, given the fact that Nick and Holly are seen walking all around the inside and outside of the Mart, just like the other characters are. If the others have been seen, it wouldn't make sense that Nick and Holly weren't.