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On the other hand if you are looking up a movie and see and name attached, you can always look for collaborating evidence and then post.
Been there done that. 
Use it for what it is, a starting point.
This week alone I've found 3 people with double entries, one I corrected and I hope they except the change and the other 2 would require some research on my part to confirm that they are actually the same person and I don't have the time or interest to actually prove what I know to be true. :)
Maggie Smith [MSMTH] is not in HPOT7. Nov 08, 07:09
Not on credits - Not in trailer - Maybe an oversight {nm} Nov 08, 07:59
DTHEW, JHURT, TSPAL are all on the poster though, so they are definitely credited Nov 08, 09:39
Then again I just noticed the production notes below so never mind. :) {nm} Nov 08, 09:40
On the other hand if you are looking up a movie and see and name attached, you can always look for collaborating evidence and then post. Nov 08, 10:56
Don't know if it is realy her but yhis myspace page page say she is. Nov 08, 09:03
I saw the film yesterday. She's not in it. {nm} Nov 08, 09:43
hmm - I don't see her in that PDF of cast that was reprinted below, nor is she on the poster {nm} Nov 08, 09:36
Thanks. {nm} Nov 08, 09:50
If I remember well the book, she probably will be in the 2nd part... not really there in the first part... {nm} Nov 08, 15:50
yeah that's how I remember it as well...not until the big battle {nm} Nov 08, 17:21
So [MSMTH] is not I say is not attached to [HPOT7] or [HPOT8] at this time and current next adjust is [GNOME] Nov 08, 18:02