New Delhi, June 14 -- the shaky vertical iPhone footage that became its own social-media beat through Madison Square Garden's playoff run - is, it turns out, the visible piece of an unannounced HBO documentary. The Hollywood Reporter first reported on June 11 that the videos were not idle fandom but raw material for a long-form film, and Page Six the following day published Stiller's own confirmation, in which he explained that he had been filming on his phone "because the second you take out a real camera courtside, you become the show."

a turn that, with the Knicks closing out the San Antonio Spurs 4-1 in the Finals on Saturday for the team's first championship since 1973, has handed Stiller and HBO an unplanned championship ending. No...