SERIES FINALE:  Tonight’s final episode of House is called “Everybody Dies,” and during a visit to the Tonight Show with Jay Leno Thursday, star Hugh Laurie dodged social media speculation that his character would die in the series finale. “Speculation is good. Uncertainty is good,” he teased. But there is an interesting exchange in tonight’s episode that qualifies as an “Extra,” or televised inside joke, between Dr. Chris Taub (Peter Jacobson) and Laurie’s Dr. House:  “Wilson is dying, your parole officer is probably on his way here right now. How are you possibly in a good mood?” Taub asks. House replies, “Did you never see Dead Poets Society? Carpe Diem.” The aforementioned Wilson – namely Dr. James Wilson, who is House’s best friend and an oncologist who’s dying of cancer – is played by actor Robert Sean Leonard. Leonard starred in Dead Poets Society, and (spoiler alert for anyone who hasn’t seen the 23-year-old film) Leonard’s character commits suicide in the 1989 drama. Don’t forget to tune in an hour early if you want to see the special one-hour House retrospective, entitled “Swan Song,” at 8 p.m. ET.