In a post-end credits scene, Fluke and Rudder repel another attempt by Gerald to join them on the rock, while the Tank Gang from Finding Nemo (2003) floats by, still in their bags, which are filthy after crossing the ocean -- except for Jacques' bag of course. They begin to celebrate their arrival before being promptly scooped up by researchers from the Marine Life Institute and thrown into a cooler where they will be presumably rescued, rehabilitated and released. The ordeal distracts Fluke and Rudder long enough for Gerald to sneak onto the rock behind them.
During the end credits there are several scenes of Hank hiding in different places using his camouflage techniques.
This film is dedicated to all our families - of every kind. You keep us swimming.