A book who wrote Merlock the Magician appeared in JAW$ in Webby's possession. Even though Merlock is an all-powerful wizard, his magic proved useless.
2. Dijon (Faris Djinn)
As our wiki says, Dijon is Faris Djin, although they bear little resemblance. His 2017 version of his name is anagram of his old name (only one -o is missing).
Giant scorpions are appeared in one episode with the same role as in 1987.
4. Colie Baba
Colie Baba was mentioned in two episodes: in Quack Pack (Duck Family was in his treasure that also happened in the original idea but Della, Goofy, Donald and Mrs. Beakley were not in the film) and in Treasure of the Found Lamp! (Scrooge reported his name).
Gene has appeared in 3 episodes and is one of the most basic character in season 3.
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I think that the Duck Family have found themselves in a movie while on their Quack Pack adventure but Donald's wish interrupted the event. Could Scrooge also have confronted Merlock since in Treasure of the Found Lamp! mentioned Collie Baba.