During the Credits
There is a photo slideshow shown throughout the beginning of the credits, followed by a couple of funny songs by Vicki and featuring MacGruber.
After the Credits
There is a very short scene after the credits that shows MacGruber in a bathrobe playing a saxophone again in a tree for about 10 seconds.
Songs During the Credits
Special thanks to ReelRhino and edge231 for the stinger submissions!