While Joe, Biaggio, Patrick and Kelly are playing Monopoly and arguing in a wood house, Joe and Biaggio's cigars change from lit to unlit between shots.
(at around 25 mins) When Patrick and Joe are crossing the river, Patrick isn't carrying any bag. Immediately afterwards, he appears carrying two bags.
(at around 47 mins) Joe has taken some money from the safe, and gone to the store to buy some food. But earlier on we hear Kelly tell Joe that since his disappearance has been all over the news, so how could he have come back when people would have noticed him in the town?
At 1:16:29 in the movie, Joe has both legs completely bent vertically at the level of his chest. but in next shot 2 seconds later, only one leg is vertically bent. His right leg is bent sideways. all this while he was of course trying to be still and he didn't make any movement.
The snake at the end has round pupils. Apart from the coral snake, all venomous snakes indigenous to the US have "cat's eye" pupils.
The local television news report describes Joe as having brown hair and blue eyes. Joe actually has brown eyes.