When you are stopped, facing forward in the cave, there is the projection, showing him ripping up tracks. I think it is after you do the backwards part, and you've stopped again before going forward. That has always been there.
After that, not far from the end, you enter another cave area where the yeti is. If you blink you can miss it, especially since she's been pretty much frozen in place, and they instead just use a strobe effect to give an illusion of movement instead of truly reaching down to grab you. If the strobe wasn't working, or your eyes didn't adjust properly, you may just have missed it.
If they actually removed Betti the Yeti, it would be all over the place...