 During the filming of the scene in which Buster Keaton (qv) is  being swept downstream towards the waterfall, he was attached to a  holdback cable, concealed in the river. During the filming of the  scene, the cable broke, and he was hurled down the rapids, battered  by rocks and limbs, and was only barely able to grab an overhanging  branch, which held him just long enough for the crew to reach and  rescue him. This scene remains in the final print, and is fairly  easy to spot. Just look for the point at which Keaton is being  pulled downriver and 1) he suddenly looks back towards the camera,  and 2) his speed in the water doubles, almost causing him to fly out  of frame.