Continuity mistake: When the villains are following Indy through the caves, the old wooden bridge completely breaks and falls apart. However, when they make their escape across the same bridge, it's intact with only a couple of wooden slats broken.
Suggested correction: You can see a goon holding it up when they come back.
The picture you put online to prove it does not prove anything at all. It's a really lousy picture that doesn't serve as any sort of proof because it's too hazy and dark in the picture to see the wooden slats.