Since this documentary has so much footage from the film, it becomes ones of those making of pieces that is ruinous to watch both before you have seen the film and after.
However there are some interesting touches. It reveals another working title for the film as "Boy Meets Girl" (thank goodness that generic one was dropped), and shows footage of a deleted scene of a real couple doing a how-we-met testimonial. Strangely, Meg Ryan is interviewed on the set and not in 2000 when the documentary is made unlike Reiner, Crystal, Ephron, and Carrie Fisher; and Bruno Kirby is interviewed at the time of filming but without his character's moustache and with a different hairstyle. We also see interviews with customers at Katz' deli where the famous fake orgasm scene was shot.
Also it is claimed that this film was Meg Ryan's first lead, which is not true.