Continuity mistake: When Libby goes to the BMW dealer, the dealer says the address is 20 Oriole Terrace. When Libby is driving down Oriole Terrace, she passes a house with four digits in the address.
Continuity mistake: When Heather first picks up the bundle of sticks she carries them to the river. During this she steps over a log on the ground and if you look closely you can see the black bag containing the guy's teeth fall out but when Heather opens up the bundle it is still there. She couldn't have put it back herself.
Continuity mistake: The writing on the tape that Alice sends to Hank keeps changing every time you see it through the film.
Continuity mistake: The entrance door to the bar, which Vann closed behind him, is ajar when it can be seen. (No one else came into the bar or left while Vann was there). (00:04:04 - 00:04:41)