All told, there are 450 effects shots in the movie. For comparison, that's three-quarters of the number in the movie Transformers, and that beauty was about giant fighting robots, whereas Indy follows an old dude with a whip. Why all the digital work? Well, there's a massive chase scene in a jungle, for example, and the filmmakers couldn't run their vehicles through an actual, virgin forest. So they shot in a sparse one, and ILM filled in the trees and leaves afterwards.