The DVD versions are four 90-minute long movies. The TV/Hulu versions are sixteen 22-minute long episodes, which are edited differently, with some jokes cut, some added, and new opening credits “tagline” jokes that aren’t in the DVD versions (since they have one opening credit sequence for each film, rather than four for each when they were edited into episodes for syndication).
I haven’t seen all of the episodic versions, so I don’t know what all is different in detail.