I think you just proved the point ten times better by correcting them.

Goku *can't* be the same person because he's not a wild boy like he was in the Manga.
Bulma does stuff in combat. Bad mistake.
Piccolo's head is Huge.
Goku is the "chosen one" just like every other american actor.

and that's only from a 3 minute clip I saw 2 or 3 weeks ago. and it was real.