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.