This movie is utter crap and was requested at my work recently by a 28 yr old anime obsessed Asperger's case. He also wanted Princess and the Goblin, The Adventures of Scamper the Penguin, and Happily Ever After.
Actually I looked up Scamper the Penguin, because I'd never heard of it and make it my business to know about bad movies, and it's a Japanese-Russian co-production.
By the way, I only posted this because I couldn't find the trailer for Don Bluth's Troll in Central Park on youtube.
I realize the pointlessness of factual nitpicking in a movie about singing dinos but was there a reason ever given for why the allosaurus didn't try to eat the kids?