did notice another reference to Sean Connery that was quite clever, the diner scene when Mutt produces the knife - Indy says something along the lines of "nice try kid but you appear to have brought a knife to a gun fight". Very, very close to an immortal Connery line from the Untouchables
Overall i enjoyed it wasn't sure about the whole alien thing, and the tarzan reference
but after considering the previous films it wasn't that far fetched really.