In the mid-credits scene, Buddy and Mel attend what they think is a costume party at Leonard's house. Buddy dresses up as a Barbaloot from Dr. Seuss' The Lorax and Mel is dressed up as a Minion. The party is interrupted when the owner returns.
At the very end of the credits, Pops says "All right, party's over!"
In the Illumination Entertainment logo, Bob the Minion is happily walking while humming a tune, until the 'MIN' and 'ION' parts of the logo light up. When the entire logo lights up, Bob happily says its name and squeals with joy.