These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
YMMV: Mystery Science Theater 3000 S 06 E 01 Girls Town
A lot of the Catholic jokes clearly came from an insider, so that one is part Self-Deprecation, at least. In fact, odds are the Catholic jokes get even funnier if you went to a Catholic school as a kid.
We're looking at you, Mary Jo Pehl. Kevin Murphy also went to Catholic School and was taught by the nuns of the School Sisters of Notre Dame, so he probably had a lot to do with the nun jokes.