Chain latch on hotel door reappears after falling off.
When Charlie first opens the duffel the present that was put in earlier is nowhere in sight.
Toward the end of the movie, when Tommy has the conversation with Rico and Benny in the restaurant, the guns in Rico and Benny's waistbands disappear and reappear between shots.
When Annette tries to attack Charlie with a fork in the restaurant, the fork switches directions between shots.
When Charlie first opens the duffel, all the heads are sealed in their wrappers, whereas before, one wrapper was clearly half-open for Annette to see its face.
During the final bit of the "headless corpses tussling with Tommy in his bed" footage, part of the CGI-removed head of the actor can be seen as a faint blurry outline above the stump of the corpse's neck.
When the mother enters the hotel room and threatens to call the police on Charlie, she picks up the phone on the night stand but you can clearly see there is no line attached to the phone. It's more noticeable when she begins pacing in the room with the phone to her ear.
When Tommy views Charlie's class graduation picture, Charlie's name is misspelled as Charlle.
When Laurie says to be careful because it's the last match, and then it gets blown out, they could just get a stick and light it from the fire they had going to roast the coyote instead of acting like it's a major setback.