Also left out Martian Successor Nadesico: The Gekiganger III OAV was left off all ADV releases of the show, but is included in the Right Stuf re-release.
Originally Posted by wAnder481
Not really sure on what "exactly" qualifies a series on this list since there's so many different release situations, but I'm just going got list what I have in my collection...
The criteria is basically whenever there's a TV series and an OAV or omake comes later (or, in the case of Strike Witches, it began as an OAV and a TV series came later). Standalone OAVs (such as FLCL) shouldn't be included.