I think the Brad Pitt impersonation is a bit too literal to source, and would like to have seen more of Jay Pharoah's Sam Jackson, but otherwise, this seems not unlike something that could be conceived on the QT. Particularly impressive is Kenan Thompson doing an actual impersonation, rather than making whoever he's doing into a version of him.
I would buy the action figures before anybody complained, for sure.
(My favorite sketch of the show after the jump. It's not necessarily nerdy in any way except the awkward one, though.)