That would be interresting for Cera to cry. About what is the question. *Thinks about it* O.o...I haven't a clue what could possible make her break down.
As for other improvements...I think when they made The Return Of The Lone Dinosaur episode they could have done Doc's character differently. He seemed really out of character to me. I have no clue what it was, but something was deffinitely wrong with him.
Here's a thought. In my perfect world he seemed like he wouldn't be sooo quick to judge someone, and when he said that Chomper couldn't be a good Sharptooth...it made me upset.

Maybe it's just wishful thinking that Chomper, and the gang of five will always be friends. I just don't know.
Maybe I was having the same reaction to his odd behavior like Littlefoot. To me he was wise, strong, and everything like what the stories about him said he was and like Littlefoot...it made me sad to see him seem less then what he was in all those stories. At the end of the episode I liked him again.
Though I do have to admit it does a good job at showing that all our heroes are human...more or less...just like us. That they're not perfect. It also was good character development.
So....I think that is it.