Quote from Jess WInfield
You'll find lots of little differences between the universes of L&S 2 and the series.
When Lilo and Stitch: The Series started production, we had a meeting with the L&S 2 producers, to make sure we weren't stepping on their story for Stitch: The Movie.
We weren't, and while they spent three years noodling around with their story, we made Stitch: The Movie and about 50 episodes of the series.
We were well into Leroy & Stitch when we (the series producers) were asked to look at an early version of L&S 2 to make sure there weren't any inconsistencies with the mythology we'd developed in the meantime.
Well, there were quite a few. One was that they had created their own names for the hula girls. We told them what we had named them; we also pointed out the inconsistency regarding Mertle's dad. Apparently they didn't feel it was necessary to revise the L&S 2 to bring it into agreement with the series mythology.