I am not 100% sure why they made this DVD extra--after all, it was only 3 minutes and 58 seconds! Considering that the movie "The Longest Day" was a HUGE movie with a HUGE cast, it's strange that a 'look back' film would be so short.
The film stars Richard Zanuck--the son of the famous producer/studio head who left this position to produce "The Longest Day". Richard himself also was a producer and studio head himself--assuming control of Twentieth-Century Fox when his dad began producing films again. Darryl apparently didn't take to this, however, and soon had his son removed from studio head--re-assuming this position a few years later! This is the stuff of soap operas--but none of it is alluded to at all--the film is all about Richard fondly remembering his father's project. Of course, considering it's less than 4 minutes...perhaps this is the reason for the film's brevity.
All in all, it's really too short to be of much interest and I'd recommend a documentary about Darryl Zanuck instead.