Disowned Adaptation: Marjorie Henderson Buell hated the cartoons, which she didn't feel were true to the original comics, and got involved with the making of those two Lulu shorts in the '60s to make sure that they were faithful to her work.
Screwed by the Lawyers: Paramount stopped making Little Lulu cartoons when they tried, and failed, to buy the rights to the character from Marge. They got around it by creating Little Audrey.
You Look Familiar: In several of the Famous Studios shorts, Lulu will meet some Jerkass man (such as a magician, a dog catcher, department store owner, train conductor, etc.) who gives her trouble for the majority of the short (or vice verse). These men all look exactly the same.
Keep Circulating the Tapes: Hasn't been seen since HBO Family stopped airing reruns in the early/mid 2000s, and there's no sign of it coming to DVD (likely because this show was produced by Cinar (since absorbed into DHX Media), and the franchise is owned by Dreamworks Animation via their acquisition of Classic Media in 2012, possibly making it a case of Screwed by the Lawyers. A decent amount of episodes are available on Youtube, and Cinar doesn't appear to mind.
The Other Darrin: Lulu herself- voiced by Tracey Ullman for season 1, then by Jane Woods for seasons 2 and 3. Season 3 also had Annie, Alvin, Iggie and Willie get completely different voice actors.