|I knew who said it and I sort of knew what episode but I had to look it up to confirm so I'm not going to answer it because that wouldn't be fair|
Here's my personal take on this:
If you said to yourself something like "Didn't X say that to Y when was going on in Episode#Alpha?" and then you check the transcript for that one and were right, posting the answer isn't cheating. If however you go from transcript to transcript looking for the answer, that would be cheating and you shouldn't post.
Of course, if a majority would prefer to enact a rule of "No look-ups even for confirmation", I will, of course, play by it.