At long last I finally got around to watch the episode. There is not much left to say for me, as basically I agree with what has been said already. I'm especially pleased to agree with this one:
All in all, it was a good one!
I did notice the shortcommings in the animation too though. They were kind of annoying in the third episode and regretably they showed quite distinctly throughout episode number 4 as well. I must also agree that Cera's half sister (I didn't see her in LBT 12 yet) looked somewhat too chubby.
For us here in America the movie isn't out yet, so this is our first sight of Trisha. :^.^:
For you in America (or me in Germany) Episode 4 isn't officially out yet either, so we can't blame anyone else for mixing up the sequence

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As for the animation, I'm willing to accept shortcomings in the animation rather than in the plots and the plot of episode 4 was good enough as far as I'm concerned.
One realizes that the makers of this episode's plot did think about the characters. Funnily enough it is often elements which some might consider negligible which I really like. Petrie's superstition about the burning mountain was quite funny and so was Ducky's rebuking of Chomper not to look at her when saying that he is hungry (They didn't forget his being a sharptooth after all

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Altogether a very good job about the dialogues
Ducky's and Petrie's comparing Cera to the burning mountain and the looks he gave them for it were just great.
[...] but I wish they would be more creative with the names ('Canyon of Shiny Stones'? That's like naming something 'Place Where the Trees Grow High and Needley.' Maybe it's just me, but I don't like obvious literal things that often)
Yes and no. On the one hand I see where you are coming from with your argument that overly descriptive names may sound kind of childish, but then again I wouldn't consider "Canyon of Shiny Stones" overly descriptive. The vocabulary of the dinosaurs is more limited than our own. Shiny Stones seems to be more proper than if they came up with precise terms such as "Quartz" or "Diamonds" (I don't expect it would make a difference to a dinosaur so long it looks nice and shiny) or whatever, for this would presuppose a certain awarenss of mineralogy and I don't see how the dinosaurs should aquire this. I suppose that shape, color, or special features of something (e.g. shiny) are the major points for dinosaurs to come up with a name for something.
How would you have them call the Canyon of the Shiny Stones Ratiasu?
Comparing it to 'Place Where the Trees Grow High and Needley.' may be somewhat exaggerated, as that example is artificially drawn out while Canyon of the Shiny Stones is not. A more likely LBT term for 'Place Where the Trees Grow High and Needley.' would be "The high needle trees" (the dinosaurs know that it must be some place and also that trees usually tend to grow, so why would they mention it?).
Ooo, the lava! Whatcha gunna do now, kids!? I can see that being another minigame on some LBT CD-rom or something. Ah, the conveniently placed (fallen) tree...it returns. Did that remind anyone else of LBT 2?
Or of LBT 5 and 6, only that they were running from a sharptooth rather than from Lava in that case. Trees often come in handy
None of us would have wanted to see the characters being fried for lack of a tree and a ledge though. Perhaps they could have made it a bit more "dramatic" and actually let the characters show some real fear. Also it wouldn't just be "hot" (as Ruby called it) that close to a stream of lava. It would be
burning hot. With the younger target audience in mind I suppose they are carefull not to make it too "scary". Oh well

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I also found that weird. I thought Littlefoot and the others were going to tell Chomper to hide, but they didn't. In the movies the grownups never met Chomper, I believe we have to wait for episodes 1 and 2 to sort things out.
I don't suppose there is any way they could hide Chomper in the long run and at the same time play with him regularly. It didn't work out with the Tinysaurs, and I don't suppose Chomper would be happy having to stay in a cave all the time. Come to think of it, it might make for an interesting story to have Littlefoot and the others try to hide Chomper; an attempt doomed to fail. A story in which Chomper is finally discovered but for some reason or the sheer perception that he is not a thread yet (and might not become one if he grows up valuing the Great Valley inhabitants as friends so he would ultimately leave rather than attack any one of them) is tolerated by the grownups. I think there could be some real emotion in such a story.
Well, Chomper is noticably larger than in movie II, maybe even larger than in movie V.
Is he really? He was bigger than Ducky and Petrie from the moment he hatched. I don't really think he has really grown very much, between LBT 2 and 5 (whatever else he may have claimed in LBT 5) there doesn't seem to be much of a difference about his size in the TV episodes if compared to the movies either. They seem to be kind of inconstand about the size of characters in general. In LBT 3 we have scenes in which Ducky is about as tall as Littlefoot's knees (and thereby considerably larger than Littlefoot's head) while during the song Kids like us She and Petrie both fit comfortably on Littlefoot's head. This is just one out of many other examples.
It seems though that dinosaurs grow very quickly in the first time after they hatch. Tricia is considerably larger than Cera was when she hatched in the original movie. Spike is perhaps the best example of quick growing. I think he more than trippled his size in the first seconds of his life. What do I say, he must have grown more than five times the size of his egg within moments (much more even).
I too wonder why Cera didn't carry the stone in her mouth. It would've indeed been easier.
I guess that's what everyone must have though. It was the first thing that came to my mind too when she was balancing that stone behind her horn. But if she had put it in her mouth, there would have been nothing to worry about for the audience, and perhaps the makers of the movies want the audience to feel with the characters (which I think is a good thing).