I remember talking to a manager when I first rode the ride and he was telling me that originally at the twisted tracks the yeti was supposed to walk over the hill and push you back down the mountain. The imagineers decided that it ruined the suspense of the attraction and instead went with subtle references like the foot prints in the snow and all the claw marks.
Something tells me the decision to have "subtle references" had more to do with the money guys than with the Imagineers.