Factual error: If you cover someone's mouth with a 2-3 inch strip of duct tape, or electricians tape, rather than go around the entire head, it is VERY VERY easy to repeated open your mouth wide, then scrunch face over and over again and work the tape off to the point where you can scream. Actually, duct tape, which is used by most of the offending movies is even easier than that. It can usually be almost completely removed in a matter of seconds. Electricians tape as used in this movie, is a little harder since it is stickier, by still can be done fairly easily. I suppose that it can be argued that people in these situations are scared, or don't know any better and therefore don't TRY to remove it. But in this movie, the main character is getting her stomach cut open and screaming in intense pain. This would cause enough facial movement for the tape to work itself free.
Factual error: After Tosh got her wrists cut, she wasn't discovered til the next morning. After so long blood stops flowing from a wound so the blood from her wrists wouldn't soak through the sheet as seen.