Interestingly, as the story goes, this half-time show is the reason the animatronic Indiana Jones figures on the ride look nothing like Harrison Ford. Apparently, Ford allowed the ride to use his likeness as long as he didn't have to do any publicity for it whatsoever. Somehow, a copy of the script for the halftime show was accidentally sent to Ford, who was so angry that he revoked the permission to use his face on the ride. Imagineers had to do last-minute tweaks to the figures, stretching and pulling the faces to distort them enough to pass legal muster.
Either that, or the sculptors couldn't get the face right and spread that story as an excuse.