James Franco (Spider-Man and Pineapple Express) showcased Saturday Night, his all-access documentary about SNL for a New York premiere& panel at the Tribeca Film Festival on Sunday at the Directors Guild of America.  The film (which debuted at SXSW in March) is a fly-on-the wall look at the show’s production week for the December 6, 2008 episode with host John Malkovich.

Hit the jump to hear audio from a very lively panel moderated by Entertainment Weekly’s Dave Karger with Franco (who’s hosted SNL twice) and cast members: Will Forte (MacGruber), Kenan Thompson (Fat Albert) & Jenny Slate (who joined the cast nine months after the documentary was filmed).  They give away several secrets, including how Franco got unprecedented access; a big dispute over MacGruber & why Kenan Thompson didn’t think Ludacris was the most supportive host.