-In The Temple Of Doom: Shangai Showdown, when you go out from the club, look to the left to see a sign that reads "Obi Wan Club".
-In Raiders Of The Lost Ark: The Lost Temple, when Belloq asks for the treasure, Indiana Jones pulls out the head of C-3PO to fool him.
-In the first level when you are on the raft, go into the waterfall to find a box or leaf. Hit it, then build the scholar panel (if you have a scholar you can get in). There will be an Ewok on the islands that waves at you before leaving.