George and Harold sing along with the DreamWorks logo music.
Continuing a running gag in the film, in a mid-credits scene, Miss Anthrope is revealed to still be on hold and George and Harold to finally answer her only for her to accidentally hang up. She screams in frustration which then becomes a new Captain Underpants comic titled "Captain Underpants and the Attack of the Stuck on Hold Woman"
End credits presented as Harold's drawings, featuring references to other Captain Underpants books and villains, such as the Wicked Wedgie Woman and Sir Stinks-A-Lot.
Despite showing a semi title, "Captain Underpants," before transitioning to George and Harold drawing a comic, there are absolutely no opening credits; the full title, "Captain Underpants: The First Epic Movie," didn't even appear until the end of the film.