Factual error: In the boat-stealing scene, when the machine gunner fires a burst of blanks out of the M60 at the Cajuns, the weapon functions perfectly. However, the muzzle is bare. When firing with blanks, weapons have to have metal pieces called blank adaptors screwed into the muzzle to keep enough gas inside the weapon to cycle the bolt. Without one, the M60 would fire one round and stop.
Continuity mistake: At the end when Axel hits TG as he's coming round the corner, the head lamp TG is wearing is on or off depending on the angle of the camera.
Revealing mistake: In the letter to Mike Gallagher attached to the newspaper, subscription is misspelled. Sally Field is a reporter, so she should have caught that. (01:19:43)
Other mistake: When the killer and the girl's body fall out of the window she's barefoot. Given she'd been dug up she should've been wearing shoes.
Revealing mistake: When the photographer is shot by Thana, his blood can be seen being thrown from offscreen. (00:36:54)
Revealing mistake: When John Jaffrey is lying dead in front of his medicine cabinet, he is still breathing.
Continuity mistake: When we see Susan and her friend David laughing, Harold's at the closed window. When Susan comes back into the room the window's open.