Let us choose if we saw the "regular version" or the "alternate version" of a movie or episodes.
like theatrical cut, extended cut, director's cut, workprint, fanedit or what else
Movie Avatar: www.imdb.com/title/tt0499549/alternateversions
Series Hannibal: http://www.imdb.com/title/tt2243973/alternateversions

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natitatito commented
Updating in 2024.. Because this is a need. Titles like Rebel Moon have director cuts (that for some reason don't qualify as separate movies to imdb/movie database) that are up to an hour extra content, with a separate title, but I can't say I saw that version
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Anonymous commented
This is very important for shows like "QI XL" and "Have I got A Bit More New For You" where the running times are different, and it affects all the stats.