I think that the best advice so far has been this one from scotthm:

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I vote for option two.  It makes your life easier and no one will ever complain about it.

It really only addresses what's easiest for me, not what is best for the online. However there seem to be no definitive answer for the latter. Well, hardly any answer, in fact. So I guess I'll listen to scotthm.

Quoting GSyren:

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Quoting AlunH:

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So I suppose I'm saying I'd rather you left the credits in, even if you're not sure - as long as the actor's right, that's the most important thing.

That's really not an answer to my question. My local profile will not have any roles if they are not in the credits and they are not documented. The only question is - should I contribute the roleless cast if there are corrections in the cast. You can't have your cake and eat it too. At least not in this case.

And btw, if you get roles from watching the film/episode, that's as good a source as any - if you document it.

Yes, I see what you're saying.  For what it's worth, I'd say submit the roleless cast.  You've done the work, you've checked that the cast are credited correctly.  If the credits don't allocate roles, then at least by uploading what's 100% correct you're giving others the chance to go back, watch the film and correctly identify who's playing whom.
  No one will agree with me, though.

As for having cake and eating it - I'm British.  If the last three years have taught you all anything it's that my countrymen are firmly of the belief that not only can we have cake and eat it, it wasn't necessarily our cake in the first place.  If anything, it was a cake we made as a gift for other people, but dammit we're British and we want it back.  And we want unicorns too.  That's what we voted for, that's what we want.

EDIT: Plus, we've had thirty years of our newspapers telling us that our cake is better than anyone else's, that everyone else has strange rules that they want to apply to our cake for no good reason [although these claims have been proven to be lies, but no one's talking about that any more] and that every time something has gone wrong with the preparation of our cake mixture, it's been the fault of bureaucrats in Brussels, not the people actually preparing the ingredients.