I think the difference is.. let's say, in a movie, A) "flash-forward" means a sudden cut to the future. For example, the scene now shows A taking the exam, feeling anxious. This scene is immediately succeeded with the scene in which A is holding his F-graded exam paper. All the procedures and details between the two scenes, between the moment of taking the exam and the 'future'(the release of the result) are skipped in a flash. B) "fast-forward" is the increase in the speed or the pace (the "2x", "4x", "8x" ) of showing the events afterwards. Unlike "flash-forward", you get to see all the events happening after 'the present' for 'fast-forward', only in a faster pace while "flash-forward" is a big jump afterwards, skipping all that in between. C) "flashback" is the antonym for 'flashforward'. It therefore means a big jump forward to the past (instead of afterwards to the future).

Fast-forward is the action you do in front of our television. For example there is a really boring scene, then you advance the tape rapidly on an electronic device (for example "x2", "x4", "x8") Flashback and flash-forward are antonyms, you're right. In series in the end of the part a flash-forward is shown what is going to happen. Before the new part begins there is a flashback shown what has happened until now.

Aha.. Thank you so much !!!! : )))))))))

Generally, Lucilla's (A) and (C) are correct, except that in (C) she mistakenly said "big jump forward to the past" instead of "big jump BACKward to the past". But I would say that in (B), "fast-forward" is more often used in movies/TV shows as the opposite of "flashback" -- i.e. there is just a 'jump' forward in time, with no 'faster pace[d]' depiction of events in between. You can also see this in written usage if you search 'fast forward' at http://corpus.byu.edu/coca/

You wrote: "One more word I came across is though, ...". When I first read it, I thought the word you "came across" was "though". The syntax is not quite correct. You could say it two ways: "Although, another word I came across was ..." -- or -- "Another word I came across, though, was ..." The first one is the better of the two.