Other mistake: When Barney gets hit on the head by the machinery, after hearing Bamm-Bamm speak for the first time, he falls backwards, with his head falling towards Pebbles' side of the cart. So how come he ends up on his side with his head on Bamm-Bamm's side of the cart?
Mel Blanc did the voice of Dino. This is only significant if you consider the fact that this film was made in 1994 but Blanc died five years previously in 1989. The film-makers used tapes of his original sounds from the 1960s TV show.