I see, thanks. I think, then, that クライマックスmust have a slightly different usage in Japanese. If I'm understanding you correctly, 映画がクライマックスの間 implies that the movie is a climax. In English this doesn't really make sense. Instead the movie would reach a climax (for example), or we could talk about the climax of the movie.
For interest, does 映画のクライマックスの間 ("during the climax of the movie") also sound correct in Japanese?