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The helium thing is certainly true, but I don't think the FTL stuff is related to hard- or softness. FTL is impossible, so it's not like you can give details on the proposed method which make it more realistic.
Maybe you're thinking of another series/canon where FTL travel is presented in a way that would qualify as "hard"?
I'm trying to think of any TV series with hard sci-fi rules actually - I think the medium is unsuited to it, with its varying writers.
Mind you it's a scale. Star Trek is harder than Star Wars, which is harder than Farscape. I think the hardest sci-fi out there is going to be The Martian. We could plausibly fly an Ares mission as depicted in the book, the main technology handwave is the lack of thin, light, radiation shielded fabric for EVA suits and Hab canvas.