There seems to be a lot of confusion about what does and does not qualify as a special on TheTVDB.
So because of a complete lack of a concise overview on the topic I've decided to spell it all out as best I can here.
In order to qualify for addition to the specials section of a television series the video in question MUST have either aired on tv or have been streamed on the official series website or network website. The only exceptions to this are pilots and episodes that weren't aired for various reasons, including but not limited to: series cancellation, being banned due to content, or just good old greed to sell dvd/blurays. As a general rule we don't allow related movies to be listed in the specials, however they're all over the site and they clearly aren't going anywhere. It's widely debatable as to if these belong on the site or not, but I personally will not remove them. A good example is the Firefly movie Serenity. This film is a direct continuation of the series and has aired on television a number of times, seems like a bit of a grey area imho so best to just let it be. Another moderator or an admin is welcome to override me on that statement, but it's not going to change my view on the subject. Perhaps on the new site we'll be able to directly link items in specials to other content sites such as themoviedb so that users who aren't using software that already supports linking such as Xbmc can keep their collections nice and organized. Now don't get me wrong, if you go and try to add the recent live action GI Joe film to the classic 80s cartoon as a special, I will probably smack you. But I digress.. all other content such as extras on dvds which are not part of the storyline (bloopers, making ofs, deleted scenes, cast interviews, etc) DO NOT belong on here unless again as I said at the beginning of this section they aired on television or were streamed on the official series website. I don't care what kind of content you find on fanblogs and youtube, that doesn't count so don't even try and make claims based on it. Directors cuts of individual episodes are also not allowed, however exceptions may be made in strange cases. Now let me lay it all out again for those who do not like to read...
Allowed: Aired or official streamed special content (such as webisodes), pilots, unaired episodes. (including OVAs/ONAs/omakes/side stories/re-tellings/recap episodes (if unnumbered or numbered with a decimal such as 4.5)/etc for anime)
Not Allowed: Director's/Extended Cuts and DVD extras such as: Bloopers, Making Ofs, Deleted Scenes, Cast Interviews (unless streamed or aired) also not permitted are compilations of seasons merging every episode into one long video featuring little to no changes. (IE: Star Wars Clone Wars 2003)
Grey Area: Movies that are a direct continuation of a series or occur within the series, I don't disagree with their listing but that's just me.
Ok internet based series are an entirely different lifeform than traditional television series. With a webseries the entire airing platform is the content creator's various sites such as their main webpage, twitter, youtube, and facebook pages. Content (within reason) found on any of the official release sites for a webseries may be added to specials, however I do ask that you do the work and add the content correctly. This includes overviews, "air" dates, thumbnails, etc. With the content online and usually described in full right on the official site there is no excuse for this to not be entered. Don't be lazy it pisses me off. Things you should not add include but are not limited to fan videos such as remixes, replies/complaints to episodes, etc. Unless in the odd case that the creators of the series specifically link to such content or add it to their own youtube channel, just keep this kind of crap out of the listings.
Allowed: Streamed content found on the official series website/facebook/twitter/youtube/etc.
Not Allowed: Fan content which is not officially recognized or linked to on the aforementioned official sites.
Grey Area: There isn't much of a grey area currently for web based content... yet.
##WORK IN PROGRESS##
This topic will be unlocked for a short time incase I've missed anything, but after that replies will be purged and it will be relocked.