There is a mid-credit scene in which King Gristle and Bridget show up just after the party has ended.
The DreamWorks Animation logo appears with a "Twenty-Five Years" commemoration at the beginning. It's made out of screens playing various DreamWorks Animation features, with the first one being Trolls (2016), and then Guy Diamond covers the logo in glitter.
The DreamWorks Animation logo turns into a scrapbook page, and the fisher boy gets a Rock Troll makeover and plays a riff on his guitar.