I also noticed that the life preserver from Coranado's ship (from the grown up Indy portion of Last Crusade) is among the props at the very beginning of the ride where the skipper often points out "danger" written on a wooden sign (just before the Temple of the Forbidden Eye)
Also I noticed some clothes on a clothes line visible just as you leave the dock. They look suspiciously similar to Marion and Indy's threads in Raiders.
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