I'm not asking to edit IMDB. I'm asking how to verify if it's not listed. From previous answers given on this site from contributors I assume that IMDB and wiki are used often and are credible sources. So basically why was my question closed?
It's an interesting question, and one that I have some understanding of.
IMDb credits are generated by the filmmakers (for example, whenever I submit a new short to festivals, I create an IMDb page for it, then start to fill in the cast and crew credits). On occasion crew members get left off the submission form - it has also happened to me, I appear as three different entities on IMDb because the filmmakers I was working for neglected to see if I was already represented and created a new page for me. This is certainly the case with other actors/crew members, and could go some way to explaining the discrepancies.
Based on the evidence of this answer in meta, does it fit into the M&TV SE site?
I'm leaning towards yes - but I'll bow to those of you who know better :)
This is a bit of an odd question. The best way to go about answering something about this, to me, is to use screenshots of movie credits/of the performer in the piece.
I honestly think its a good question though, I can see @DForck42's hesitation at the question as I had the same hesitation. But after re-reading it, it made more sense to me and I figured if it didn't, then people would flag, and I would review it further.
That said, if it gets any reopen votes, I wouldn't mind doing so and see what happens.
I guess I misunderstood what you are trying to ask. So, to rephrase this, are you wanting another place/reference to double check and see if an actor/actoress is in a piece of work? IE, cross-referencing IMDB with Wikipedia?