1.) Despite the fact that Bron was still alive, the narrator says that Littlefoot, his mother, and his grandparents were the last of his herd.
2.) How things went when Littlefoot told the Great Valley about Chomper coming.
3.) Why the narrator in II says that there are two types of dinosaurs: Those that eat leaves and those that eat meat (other dinosuars). However, in that very same movie, there is Ozzy, who eats EGGS.
3.) If Topsy is Cera's father's real name.
4.) If Guido was orphaned at a very young age and cannot recall his parents or family and hence thinks he's one of a kind. (I think he still is, but I think there are other Microraptors out there. He just hasn't found them yet.)
5.) Is Guido a Sharptooth flyer? He eats bugs like Chomper.
6.) Has Chomper been eating leaf eaters between II and V? I'm wondering, his parents didn't seem to question him when he said that he had longneck for breakfast. One would think if he'd only eaten dragon flies and whatnot, they'd have found his comment of eating longneck to be phony (or one almost wold surmise that anyway.) One also wonders, if, like Littlefoot's Grandparents kept giving him food till he ate it, Chomper's parents kept giving him meat, till finally he said "Well, they're already dead and I didn't knock them off myself, so, might as well."
7.) Why Shorty, even if he was orphaned, why he has such a tude problem and is kind of a bully. On the flip side, Littlefoot thought he was orphaned for years, only to find out he still had a father, yet, in all those years, he doesn't have a tude problem.
8.) Do Sharpteeth suffer from herd segregation too? Other than Dil and Ichy, who got along oh so not well, we've never seen, say, Tyranosaurus and Belly Draggers working together or any type working together. In fact, as far as I can tell, other than VI, where it appears to be not a partnership but just chance, we only see Sharpteeth of two different types working together one other time, a very notable occurance: Red Claw (Tyranosaurs) and Screech and Thud (Fast Biters). I doubt any other time they ever work together well. One almost thinks that Red Claw figured out a way to get Sharpteeth to work with other Sharpteeth herds (at least, Sharpteeth loyal to HIM anyway). That would make huge sense as to the plot of the TV Series, as if neither Sharpteeth nor Leaf Eaters in the Mysterious Beyond would work outside of their own herd, that would give Red Claw, who might have managed such a feat, perhaps through brute force and intimidation, though perhaps he has brains too and has worked out a thug network somehow, perhaps stealing food from other Sharpteeth to pay them off. Anyway, the one place that has been well documented to have herds working together would be, you guessed it, the Great Valley, which is pretty much why Ruby and Chomper stated they had gone there. It wasn't so much to hide from Red Claw for the rest of their lives there, but to try and observe the Great Valley dinosaurs and how they work together and then teach dinosaurs in the Mysterious Beyond those lessons so that they could work together and overthrow Red Claw and his goons.
9.) Why didn't Ali, who had encountered Sharpteeth like Dil and Ichy, and who knows what else in the Land of Mists, have a least a grain of doubt when hearing Rhett's whoppers? Also, have Ali and Littlefoot grown further apart since IV as she seems kinda snobby to him in the TV series?
Perhaps Rhett was her sole companion of her age and she kinda grew close to him. On the other hand, if Littlefoot and Ali WERE meant to be a couple in the future, does this mean a love triangle between Littlefoot, Ali, and Rhett is looming?
10.) If Hyp was a teenager in III, is he an adult by the time of the TV series or still a teenager?
11.) Does anyone know at what age Littlefoot would come of age (i.e. dinosaurs probably didn't have the same lifespan as us and some may well have had a longer lifespan than us.) ? That might be an important factor in determining how many movies to make before he becomes an adult.
:unsure:
12.) Has anyone else noticed that Typpy in the TV series and Lizzie in XI sound like Suzy Carmichael from Rugrats?
13.) Has anyone ever thought how Littlefoot would get married, barring Ali's return or another longneck herd coming to the Great Valley? Despite what his mother promised him, there don't seem to be any other longnecks (that aren't his grandparents and aren't Littlefoot himself) that reside in the Great Valley. (Maybe they are hiding and will come out in future movies, but still, one woulda thought they'd have shown by now. True, I think we might have seen another longneck in V with them, but, heck, she was full grown too.) I know one longneck went back to the Great Valley with Grandma and Grandpa at the end of X, but still, that won't help Littlefoot find Mrs. Right.
14.) On the same subject as 13, Spike would have the same problem, being the only spiketaill in the Great Valley. Petrie, Ducky, and Spike seem to have other of their kind, or probably do, but Littlefoot and Spike don't seem to.
15.) Are Littlefoot and Ali first cousins or third cousins?
16.) Are Chomper's parents and Red Claw open to canniablism? If one notices, their comment about eating any friends of Chomper's as dessert in V doesn't seem to indicate what type the friends are. Not only could they be fellow Sharpteeth, they could be fellow Tyranosaurses. Also, it seems, maybe I heard wrong, that Red Claw wants to eat Chomper in the TV Series. (So do Screech and Thud, so maybe Sharpteeth eat each other too. Maybe the leaf eaters should use that to their advantage.

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17.) How Chomper kept his name that Littlefoot gave him and his parents didn't change it or wonder where he got it from?
18.) Where Mo learned to speak Leaf Eater?
19.) Why Fast Biters are called Fast Biters? (I can see where they got Fast Runner as they run fast. Most leaf eaters run (or DIE) when Fast Biters start biting so one would think they wouldn't have much time to measure the speed of their biting versus that of other carnivores.)
20.) Why Chomper, having seen his parents chase Littlefoot near that log in II, would think they'd suddenly be nice to Littlefoot for no reason in V. Has he ever seen her parents kill something (perhaps Ozzy or Strut too, we don't know on that) or has he always covered his eyes or been off chasing dragon flies at the time?
21.) At what point did Chomper stop trying to eat dragon flies and decide to eat bees instead?
22.) Why didn't Ozzy and Strut just turn around that corner instead of leaping off the cliff. If that HHAD been a grown dangerous Sharptooth, he'd have had his fill with the kids and Ozzy and Strut could have stayed out of sight and watched them die, something one would think, given Ozzy's personality, he'd probably get a kick out of?
23.) Why Chomper didn't say "Hey guys, it's me Chomper. Hello." when encountering them, but just stood there, opening and closing his mouth, casting that creepy shadow, and letting the kids run and only speaking to them when they were trapped against the wall, cowering and expecting to die at any moment? Was that his idea of a practical joke?
24.) Did Cera outgrow her foolhardiness around villains that she had in I, II, and IV? (She was ramming Sharptooth in the first movie, idiotically told Ozzy and Strut that Chomper was a baby in II, and went "Heee!" when Dil and Ichy were fighting each other and they would have gotten away otherwise if she hadn't opened her mouth in IV.)
25.) Was Littlefoot ever offended when he found out he had been named after his father's childhood nickname?