Revealing mistake: When Weasel says, "How's your back, baby?" to Phyllis, she spits in his face, but Weasel closes his eyes before she spits.
Revealing mistake: Just before Louise shoots him, Andrew turns to face the camera, and the blood packs under his shirt are very visibly outlined.
Revealing mistake: When Stewart's wrestling with the alligator look closely and you can see the black strap keeping its jaw shut.