On Pacquito's Birthday listen to the little boys voice, it sounds fake. In a Twilight Zone episode "The Bewitching Pool" there is a child's voice dubbed by June Foray. June did Rocky the Squirrel voice on Bullwinkle. Pacquito's voice sounds the same.
From the first time I saw the episode when it first aired back in the 80s, I always thought the same thing. His voice doesn't match the kid's mouthing of the words. I remember reading somewhere else that maybe his own voice had a heavy accent and they needed to resort to dubbing in someone else's voice to rectify the situation. But I'm glad that you also noticed it. It has bugged me (and continues to) any time I see that episode.
Glad to hear an explanation. The voice sounds like a cartoon voice. I think I have heard this voice dubbed for other child actors as well. Am I correct?