Corrected entry: It is said that ghosts don't crossover as long as they have unfinished business. This means Casper, Stretch, Fatso and Stinky should have unfinished business, but why they are present is never explained.
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Correction: I don't see how this could be considered a plot hole. It's just an element that they decided to ignore. The story is about the misadventures of a friendly ghost and some annoying ghosts. Why they're there really doesn't play a part in the theme of the movie.
Knever
That still doesn't answer the question as to what their unfinished business is which they have seen as how they haven't crossed over.
Except this wasn't posted as a question. It's listed as a plot hole, which it's not. Casper and the others have unfinished business that could be something simple as their deaths never being solved. Something not being explained doesn't make a plot hole.
Bishop73