Besides what others have suggested, I'd want ...
-- a feature spotlighting guest stars who went on to bigger things (such as Teri Hatcher and Jennifer Aniston, off the top of my head); maybe short interview clips with them would be nice
-- interviews with the costume designers and set directors; how they got such accurate period designs on a limited-budget series is remarkable
-- an explanation of the special effects used, primarily the blue "leap" effect and Al's walking through walls
-- easter egg of Don thanking the fans directly, like the eggs they had with Scott and Dean thanking us in Season 1.
Wishful thinking department. Had ABLF gone into production by now, I would've liked an easter egg where the actress cast as Sammy Jo announces the coming of the telefilm and the series. "Hi, I'm (name), and I'm proud to say that the story of 'Quantum Leap' will live on! In Fall 2006, ... (describes ABLF and her role as Sammy Jo) ... I can't wait to bring the show to you all! See you on (network)!" Wouldn't that create a buzz!
-- Mike