When Drake is putting on the costume at the prom, the mask he uses covers the top of his head -- but throughout the rest of the scene, it's shaped like the mask he usually wears.
During the scene where Megavolt gains his powers, he's wearing his goggles for a second.
At one point in this episode, darkwing's beak is missing!
Megavolt: I may have lost, but at least I know Darkwing Duck's secret identity. He's...Elmo Sputterspark! No, that's not right...He's Ham String! No, wait, that was the big guy...Aw, darn it!
Ham: Aw Gee, Drake, sorry for acting like a chowder-head.
Darkwing: Aw Ham, you weren't acting!
Megavolt: Alright Darkwing, you may be tough, but I'm not! Or something...
Megavolt: All is lost! No-one can save you now! You're chemistry!
Megavolt: No, not chemistry...math! Is that...? No, history! That's right! You're history!
Megavolt: I am...Megawatt!
Band Leader: Hey, that's our name, man!
Megavolt: Oh, sorry. In that case, I am Mega...volt!
Drake: Did I ever tell you about my good old high school days?
Gosalyn: Run, he's about to reminisce!
Gosalyn: You mean to be telling me you've been fighting him (Megavolt) since you were in high school?
Darkwing: I am the fast food that comes back to haunt you.
Darkwing: I am the grade curve that gives you an F.
Megavolt's original name was going to be "Dim Bulb".
When Drake is trying to make up his superhero name he considers: The Purple Poultry, The Web Footed Wonder, The Quackmeister, Captain Quackazoid.
Final appearance of Megavolt.
Megavolt's origin is revealed in this episode.
The episode title is a play on the event known as a Class Reunion
Megavolt: At least I'll finally be rid of those meddling kids and their nosy dog! Whoops, wrong cartoon.
Megavolt is obviously referring to the phrase that practically every villain in the Scooby-Doo cartoons would say after being caught: "And I would've gotten away with it, too, if it weren't for those meddling kids!"