Continuity mistake: As the giant mosquito flies toward Mr. Davis, Davis has the remote control which controls the mosquito hanging around his neck. In the very next shot the remote control has disappeared.
Continuity mistake: When "Tina" ties up Bud in his wheelchair, she puts a belt around his body. The belt shifts/rotates around his body between shots (you can tell by a patch on the belt, which moves around).
Continuity mistake: When The Possessor puts a mask of Toby on, in front of Maggie, he then takes it off and puts it on a metal tray. He then takes a second mask and puts it on. then, when he goes to put the second mask down, the mask of Toby, which he left on the tray, is now placed on a foam dummy head.
Continuity mistake: When "Tina" places the tape recorder down in front of Bud, the black strap on the tape recorder is on the left side in one shot, but in the next shot it is on the right side.
Continuity mistake: When 'Tina' is attacking Bud, she puts tape over his mouth. In one close-up, the bottom of the tape is folded up, revealing the bottom half of his mouth, but in the subsequent wide-shot, the tape is perfectly neat, and unfolded, covering the whole of his mouth.