Extinct Creatures-- The Land Before Time (Patreon)
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Ducky-- at her size, she wouldn't have grown a crest yet, and Parasaurolophus wasn't bipedal, so she'd be on all fours most of the time.
Petri-- wouldn't have had a crest yet and would have been covered in hairlike pycnofibres.
Spike-- for the longest time I had no idea what Spike was supposed to be, but apparently he's a Stegosaurus, which explains why he is the Dumb One. Stegosaurus had the smallest brain-to-body ratio of any dinosaur. He would have already had some plate growth at his size, and even a wittle Thagomizer (the spikes at the end of the tail, named for a Gary Larsson cartoon!)
That baby T rex from the 2nd movie-- would have been covered in a coat of protofeathers. Regardless of how fluffy the adults may or may not have been, the babies would benefit from some insulation.
Littlefoot and Cera-- they're basically fine.
And of course, if we're being ENTIRELY accurate-- Littlefoot and Spike were both around in the late Jurassic and lived in the same region, so they could've been pals. But Ducky, that T rex, and Cera lived about 78 million years later, and Ducky may have died out a few million years before meeting Cera or the T rex (though I put them on the same page in my book because look, you can only be so accurate while trying to tell everyone about every cool dinosaur). And Petri would have lived a full 12 million years before Ducky and Cera and the T rex, and would have spent most of his life at sea, eatin fish.
Anyway, so that's that!! I know some folks really don't like these pedantic "let's pick apart a piece of children's media" things but they are very fun to do. I definitely don't fault Land Before Time for most of these fixes, considering when it was made, but it's still a fun exercise!