It's never revealed what becomes of Dave the bike shop owner gagged and tied up in the closet. (If he heard Henry's rap, he too may have fallen under its influence.)
Why Henry punches Schwoz in the face is never explained.
There is nothing in Kid Danger's rap song that instructs the villains to whack each other over the head, yet they do. To whack their own selves, yes, but not each other.
Charlotte, brainwashed and filled with Girl Power by Dr. Minyak, scans Captain Man, sizing him up for an attack, and displays glowing red eyes before Henry. This is to make her look like a terminator from the film The Terminator; but, she's a human girl, not a robot, and shouldn't have these capabilities.