Continuity mistake: When Tom tells Gail he won't take part in the rafting trip and she sits down on the bed, her hair changes several times between tucked behind the ears and hanging straight in alternating shots. (00:04:35)
Continuity mistake: Later into the morning of the second day of the trip, after Wade and Terry have shown Gail and Tom the rapids they were afraid of, you see a silhouette shot of the whole group against a beautiful evening sky. (00:20:30)
Continuity mistake: On the first evening of their trip Gail talks to Tom about his work. You see her resting her chin in her hand, but when the camera angle changes her hands are down. (00:17:05)
Revealing mistake: When Gail throws a stone to make it bounce on the water you see in slow motion that she fakes the throw with an empty hand, and only in the next shot do you actually see the stone bouncing. (00:27:25)
Continuity mistake: After they have passed the first rapid where Tom fell into the water Gail is rowing and the river is flowing quite fast. In between is a brief cut to Rourke where the boat is not moving and the water is totally still. (00:14:10)
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)
Continuity mistake: Gail, Tom and Rourke get tied up when they take off with Wade and Terry. However, when they take a food and pee break they leave the raft apparently untied, with no evidence of anyone untying them. (00:55:00)
Continuity mistake: When Tom sets up the trap with the cable across the river the water is calm and almost stagnant. When the raft arrives the water is choppy and flowing fast. (01:23:35 - 01:37:25)
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.
Revealing mistake: In the final showdown, when Gail points the gun at Wade who is standing in the water, the raft isn't moving altough the current is pretty fast and the raft didn't get stuck anywhere as the cable is up in the air again. (01:37:55)
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: When Wade tries to shoot Maggie, Rourke chases her up the hills, running after her. When Wade comes to scold him he is standing right on the riverside. (00:49:00)
Continuity mistake: In the scene where Wade almost drowns he is seen in the middle of a huge stretch of white water. When Tom comes to his rescue the water is clear and only slightly choppy. (00:24:30)
Continuity mistake: When Wade shows Rourke his gun the river is either wide and calm or narrow and choppy, depending on the camera angle. (00:40:25)
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)
Continuity mistake: When Gail appears with Rourke's birthday cake he looks up to her and follows her with his eyes while he walks around the fire. Next we see a close-up of him, and he looks up to her again. (00:32:30)
Deliberate mistake: When Wade "hits" Roarke for telling his parents about the gun, it's very obvious that his hand doesn't come near the boy's face.
Chosen answer: He's finally had enough of Wade's increasingly psychotic behavior and no longer trusts him. As a result of Wade's actions, their entire plan is unraveling. Terry likely knows that Wade will probably kill him as well.
raywest