The stilt walker was noticeably absent for the majority of our runs this weekend, however Saturday night, at the end of the night, he was there for the first and only time.
The ending "Waterfall" scene was never actually water this weekend, and according to the Unmasking guide, it is supposed to be a funneled fog effect. The floor is solid, indicating they have either permanently shut this down, or it never was actual water in the first place.
There was definitely at least one Brooder scare that was replaced and recast after the first rehearsal, as the costume could not fit out the opening. This is the scare right after the circular raised section with the red scuba guy, the woman with the harpoon gun.
Finally, not to beat a dead dog here, but apparently it was even more disturbing during employee preview, and they actually turned the effect off, but the management was quoted as saying they'll be damned if they turn the whimpering sounds off. (Also, the dog's name in the house is actually Helix, to confirm, and the dog playing him in the before photos is named Woody irl)