Continuity mistake: When Joe and Gus enter the diner towards the start of the film we see the waitress come over to see if they are ready to order. The camera switches from looking at Gus and then to Joe. When the camera is on Joe, we see the guy sitting with his back to Joe turns his head round to the left to look at Joe and Gus. Then when the camera changes angle to look at Gus and Joe from in front of this guy, his head is twisting back round from the other direction (right to left).
Continuity mistake: When Joe and Gus are riding in the swamp boat, the first time the camera faces Joe, he is wearing sunglasses, then it shifts away and comes back and he is not, and then it cuts one more time and he is wearing them again.