So, this should explain Walter's brief unnecessary interaction with the cat lady back in page 5. Hope it takes a little bit of the sting out of having to wait all those weeks before we got to the good stuff, taking my time setting stuff up like this lets me have small pay-offs like this later on.
The whole page is a dumb little joke but I think it's necessary as a little handwave moment for people thinking too hard about the consequences of a professor fucking his student, between this and the rhino's reaction in the previous page. Just enjoy the ride.