There is always a bit of a movie after the credits.  At the end of the first one you see the monkey with a coin in his hand.   It's a lead into the second film. And I assume the one at the end of movie 2 is a lead into the last film.

I'm one of the geeks that likes to read the credits,  LOL

"It is good to see ourselves as others see us. Try as we may, we are never
able to know ourselves fully as we are, especially the evil side of us.
This we can do only if we are not angry with our critics but will take in good
heart whatever they might have to say." - Ghandi