The episode "Dude, Where's My Head" is a title reference to Dude, Where's My Car? (2000). This is accurate, because Coop loses his car when he allowed Jamie to use it, which is the control center (head) of Megas.
You maniacs! You blew it up! You blew it all to - wait... hope I didn't do this...
At the end of the closing credits, the Cartoon Network logo opens to reveal Megas opening fire with his blasters, and one blast ricochets and knocks him down.