If it is Zagreb (and I can't be bothered to watch it) why anyone would want to produce such a thing, so long after the event, is beyond me.
It was made only 3 years after the accident.
Given that it was based largely on transcripts from the trial of the controller and (controversially, at the time) from the CVR, it seems a little unfair to criticise the makers.
Some interesting background on the film, and the reaction to it, from Flight at the time:
1979 | 0638 | Flight Archive