I was just watching Dink, The Little Dinosaur, episode entitled "Surprise!" and I couldn't help but notice that some of the scenes were strangely familiar.
Here are the similarities between this episode and LBT IV:
1) Dink wonders alone into the outskirts of the valley (like Littlefoot with Ali)
2) Dink does so to go to the Waterfall Valley (like Valley of the mists)
3) Looking for a special stone as a gift to Amber (it's her birthday)
4) She's mad at Dink because she thinks he forgot (like Cera is mad at Littlefoot because he hangs out with Ali)
5) Dink is helped and helps out a small mouse (like Tickles)
6) Dink is chased down a river by a crocodile (pretty much like what happened with Cera)
7) Dink enters a cave where he finds the stone, the cave is behind a waterfall
8) There's always an old turtle, he's part of the cast, but he's the one that shows Dink the way (pretty much like Archie in LBT IV)
Granted no one's sick, and although there's a sticky flower in the episode, it does not resemble the night flowers, and there's no Ali, and the crocodile is only on screen for about 10 seconds, however, you got be suspicous about the originality of the sequel...