As suggested by some I guess cats would (eventually) learn to move in zero-g. I also guess that these cats didn't get enough time to "learn" what to expect and their disorientation kept them from turning to land on the oncoming wall. Their eyes tells them that the "human" is sittning on the floor and for some reason they're floating towards the ceiling.

It's not like cats evolved in a place where the direction of up changed that often.

I wonder if "zero-g cats" would learn to use their claws to hold on to "walls" (provided suitable surfaces were provided).