Continuity mistake: When the actress has been killed, and they walk around outside, they are getting all soaked. But when they catch the convict, all of the people are dry, and so are their clothes, even though there's quite a long walk in the rain from the motel to this building.
Suggested correction: This scene, like most of the movie, takes place within the mind of an insane person. Take, for example, the moment when one of the criminals tries to run away from the hotel, only to find himself back inside. Real-world science doesn't apply here. If Malcolm imagines the characters as being dry at this point, then that's possible because none of this is actually happening in reality.
Character mistake: There's no way that using a regular needle and thread to sew up that wound would work the way it's shown. Anybody who knew what they were doing - which John Cusack is portrayed as knowing - would also know that using unsterilized materials and instruments without a sterile field from an uncleaned massive open wound is a great way to kill your patient.
Suggested correction: The main plot of this film takes place inside the head of a murderer with dissociative identity disorder. The fact that stitching up a wound in that matter wouldn't work is irrelevant to the fact that it is how Malcolm is playing out the scenario in his head.
You're making a good point to invalidate a "character mistake", but couldn't the entry be reclassified as a "factual mistake" and stand as written?