Continuity mistake: When Tom escapes he climbs up the steep rocks on the riverside. The height at which he is shown varies dramatically depending on the camera angle, and when he finally falls down into the water (unharmed, after bouncing from rock to rock.) he would actually have landed on the bank which was shown in the shot before. (01:13:30)
Revealing mistake: In the scene where Tom and the dog Maggie are having to jump off the cliff, Tom jumps first and then tries to persuade "Maggie" to jump after him. She finally does, but as she leaps, the camera is below her, revealing male dog anatomy.
Continuity mistake: On the second day of the trip, after Wade and Terry have killed their guide, they wait for Gail to guide them down the river. They walk up the steep riverside to have a look at the rapids, and there is one shot where you see that the rapids are much wilder, and the water flows into the opposite direction. (00:19:35)
Continuity mistake: Wade and Terry are supposed to follow Gail's raft through the rapids keeping to the extreme right. In this scene their position on the river varies a number of times, but there are many a shots where they are sticking to the extreme right as they should, but Gail screams that they are on the wrong side. (00:23:35)
Continuity mistake: The scene where Gail and Tom try to escape Wade is quite an editing mess. First Gail sends Rourke down the river fishing so that they can pick him up later. When no one is watching they paddle off and try to fetch Rourke, but Wade catches them. They start fighting, and finally Wade cuts up his raft, which is suddenly there and not at the place where they had landed originally. Finally you see a shot of the cut-up raft at the original landing place, and in the background Gail and Tery carrying stuff to the place where Gail's raft was. (00:49:35)