Some of the worst editing ever in a movie.
And I only noticed this from loving it and watching it so much...some examples of this include...
when they are traveling to the small town and the camera pans out from the car on the road, it's clearly not the actors in the car.
When they fall off the waterfall, none of the men are in the locations, approximate to the drop, that they were before going over.
When Jerry leads them to the right hand side of the river split, they try and make it seem as if the two sides lead to different points, but the camera panning out clearly shows the river comes to the same point about a half a mile to a mile up.