I’ve seen the cat in the wall interpreted as the two cats being a metaphor for Mac and Dennis, and coming out of the wall being coming out of the closet (Aka, if Mac comes out, hopefully Dennis will follow) I genuinely really like that reading, and it make sense with future context, but I don’t feel like it was the original intent. In the end, the cats are a metaphor for the whole gang. Charlie suggests putting four cats in the wall, and Dee suggests putting in a bird. So four cats and a bird = the four guys and Dee. In this scenario, the wall is a metaphor for codependency, and therefore coming out of it would be a metaphor for independence. But none of the cats, and none of the gang are ever going to come out of the wall. As Charlie says, they chose to be there and they want to be in there. Through thick and thin, the gang will be always be trapped in their mutual codependency.
