Symbolisms in Indiana Jones

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I;m sure a lot of you guys have watched the movie and yeah, a lot of you didn't like it as much as the first three ones. In Indiana Jones and the Crystal Skull, as in all movies, a lot of symbolisms were shown. One was at the end where shia picks up his dad's fedora and is apparently drawn to it. Indy steps in and yanks the hat away as if to say it's not your time yet. Apparently this signifies that there will be more Indiana Jones movies to come and they might star Shia as the successor to the whip-cracking fedora wearing hero we have all come to love. Please share more symbolisms as found within the movie.