The film is set in specifically 1975, they went to great lengths on this, we went up on the filming day and they even checked our watches, told to turn them inside, no nike swooshes etc, although Adidas would have been ok okay i presume in 75? not sure, anyways they are trying to nail it bang on, I think they will do a graet job, looking at the dancers hairstyles etc.
Elaine was consulting Richard all day bout different things.
Dont think its worth being pedantic and geeky, but it should be right on the money for 75 (which was before my time)