<P> In a Twitter post on April 5, 2011, Bill Lawrence confirmed that Janitor was telling the truth when he revealed his name as Glenn Matthews . </P> <P> As revealed in the DVD commentary on several episodes, the Janitor character was initially to be used as a figment of J.D.'s imagination if the show had been canceled during the first season or the first half of the second . This would have been revealed to the audience in the finale . </P> <P> From the beginning of Season 2, Flynn joins the rest of the main cast appearing in the show's extended opening credits, but the credits were changed back due to objections by NBC, who wanted longer episodes instead . However, he was still acknowledged as a main cast member by the producers as of the second season . Since the start of season two, Janitor has had encounters with most of the other regular characters . He has even had an entire episode ("His Story III") devoted mostly to him . Along with this, in the season 1 episode "My Bad", Elliott throws coffee on the floor and as Janitor looks up in anger she seemingly engages with him and sarcastically says "sorry". </P> <P> Flynn is an improv comedian and, as such, ad - libs many of his lines . Although it is often stated that Flynn ad - libs all of his lines, on several parts of the Season One DVD commentaries and special features, both Flynn and series creator Bill Lawrence say that it is generally a mix of ad - libbed lines and the original script, with Flynn usually building on the original lines . Lawrence has also said that the rest of the cast followed Flynn's lead and that he (Lawrence) would occasionally enter the rehearsal room with no idea what scene was taking place due to its lack of resemblance to the original script . Janitor's alter ego, Dr. Ján Ĩtor, is a happy consequence of one such moment of inspiration . Sam Lloyd once commented on Flynn's improvising: "I opened my script up once and it said' Janitor: Whatever Neil says,' and I just started laughing ." </P>

Who plays the janitor's dad in scrubs