I once lived in a house with an ancient HVAC system and grills that went directly into the walls. The grill in my office only had one screw and was sort of shoved in one place. I came in one time to discover one of my cats had got it loose and was halfway through into the wall. With visions of explaining that one to the local fire department, I managed to get hold of his haunches and haul him back out. Then I found a screw and made sure that rusty old thing was fixed in place but good.
Good news: In spite of his occasional death wish, said cat managed to see his 19th birthday, eventually. But yes, it is possible for cats to get into a wall. Though, in much-older houses, a dead cat in the wall may be from a ritual that people in some parts of the U.S. and Europe used to do in order to ensure the structural integrity of the house.
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It could happen, but not bloody likely, so to speak.
I had a cat trapped in my floorboards for a day when she wandered into the space the plumber was working in the bathroom. I kept tapping and calling for her, and finally she made her way out.
The walls would be a different story, but she might have heard a mouse and entered through a hole somewhere. The sequence of him smashing the wall to take her out was surprisingly well handled, in my opinion.

With all the absurdities presented in this film, you're most concerned about cat in a wall? No concern about covering corpses with a thin layer of clay?

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Can somebody explain to me how that cat got stuck in the wall in the first place?
In the remake "Bucket of Blood," starring Anthony Michael Hall, the cat got in through a large hole in the damaged wall before it was repaired. This isn't exactly shown in the original though.
Initial Success, or Complete Failure

When my (Sailor) husband was assigned to the West Coast we chose to drive and my brother watched our cat for about a month until we were assigned housing. I didn't find out for years that he had lost our cat for about four days in exactly that manner. He and a number of fellow college students were renting a very old house and Pyewacket found his way between walls and floors. Eventually he found a way back to the 'normal' part of the house.

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It may have been a mystery how the cat got in the wall in the first place or how he come to be suspended in the air, but I was more amazed at how rigamortis instantly set in and the cat was already as stiff as a statue when it was pulled out of the wall.

I just watched this movie and I actually liked it! Seeing a young Ed Nelson and Bert Convy was pretty cool too. As for that cat in the wall, it sure got stiff in a hurry, didn't it?! Cool movie nonetheless.

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carts explore, i know if they were able to find a way in my cats would be in the walls all teh timehe lives in an old house, there's bound to be hole in the wall, or even in the roof and attic. cats are noseyand curiousity really did kill the cat this time
i wanna see what your inside look like
i bet your not f@*$en pretty on the inside