Quite a lot of Disney movies have had some kind of fun thing in the credits - bloopers, a quick scene, a character saying goodbye to the audience, etc - over the years. Frozen has a scene with Marshmallow at the end, a handful of Pixar movies have bloopers, and of course people pointed out Pirates already.

As for not Disney, Planes, Trains, and Automobiles has one of my favorites!

Also there’s actually a Wikipedia page dedicated to movies with credits scenes or audio design. It’s not an exhaustive list as far as I’m aware but it may be a good place to look too. :)