Doug began playing Build-a-Title frequently on the show starting with Episode 220. In this episode, he mentions it as something he had already been playing on Twitter. His guest, David Huntsberger, mentions he thought the game had its inception during a trip to Sacramento with him, Doug, and Dan Gabriel.
Doug says you can drop the at the beginning of a title, and "it has to be motion pictures that I can verify in the 2007 Leonard Maltin Movie Guide." He says that extra clever punny titles may be reason to stop the game at that point. He mentions awarding prizes on Twitter (for "Build-a-Title Tuesday").