I learned this interesting fact from a comment on a YouTube video yesterday. In this scene from Future Imperfect, notice how Jonathan Frakes pronounces "charade" (at 1:55):
Compare to how he said it here in the episode promo:
Why the difference? Was this scene dubbed over later or re-shot? Did that kind of dubbing happen a lot in Star Trek? I could not find anything about it on Memory Alpha, which makes me think it might be commonplace and not notable.
The scene from the promo was most likely raw footage, taken directly from the boom mike on set. The line from the actual episode was then redubbed using a technique called ADR (Automated dialogue replacement) where words that are slurred or pronounced with a colloquial accent can be corrected later.
According to the show's 'dialogue rerecording mixer', Chris Haire, some episodes had as much as 50% of all dialogue being redubbed after the fact (and not just the lines spoken by people in latex makeup either).
Still, technical problems are not the only cause of dialogue replacement. The producers place a lot of emphasis on the clarity of speech, and that means not only rising above extraneous noises, but also steering through strong accents, masks and false teeth. 'It's a very dialogue-orientated show in addition to the sound effects.' says Haire. 'A typical Star Trek episode averages about 150 lines of ADR, and a heavy show will be in the 300s. 300 lines is about half--or maybe more--of the total. That, however, is down to the fact that the producers want every word to be pristine; clean and perfectly spoken. If a word is slurred or its pronunciation is too colloquial, then the actor will be brought in to redo the line.
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This has always bugged me. I seem to remember Riker saying Sha-RAHD in the episode itself, perhaps when it first aired.
But now it seems that he said it in the promo only. Is it possible that the dialog was ADR'd AFTER the initial airing of the episode, or does it not work like that? That is to say, once an episode is done and aired, then it's DONE.
EDIT: According to a trivia tidbit on IMDB (Alternate Versions):
In the original broadcast and the Columbia House VHS version, when Riker discovers the Romulan deception and says, "Shall we end this charade," he pronounces the word "sha-rad". This line was later ADR'd by Jonathan Frakes for the DVD to say "charade" pronounced "sha-RADE".
