"The Daily Show" filmed its final episode Thursday after 16 years on the air with Jon Stewart as host. REUTERS

The final episode of "The Daily Show with Jon Stewart" airs Thursday evening, and the host is expected to pull out all the stops for the much-anticipated finale. While no guests were officially announced, Twitter has given fans some pretty telling hints.

Comedian Ed Helms, who appeared on "The Office," was not reticent about his visit to the set Thursday, tweeting, "Celebrating the end of an era with @StephenAtHome and @SteveCarell. #JonVoyage @TheDailyShow #JonStewart," along with a photo of him, comedian Stephen Colbert and his "The Office" co-star Steve Carrell. Both Carrell and Helms once worked for "The Daily Show" with Stewart.

Frequent guest Doris Kearns Goodwin, a Pulitzer Prize-winning author, also tweeted from the set. "#JonVoyage Thanks for the memories @TheDailyShow. Never could I have imagined the joy of being repeatedly bleeped! " she shared.

They were not the only ones reportedly at the afternoon taping. Bruce Springsteen was spotted arriving at the set Thursday afternoon. Stan Goldstein, a Springsteen expert, speculated on Twitter that Springsteen will be performing at the final show. “Look for Bruce Springsteen and E Street Band to be on Jon Stewart's final show on Thursday,” he said. He then tweeted a photo of the band's setup as proof.

Beyond speculation, fans will have to wait until the final episode airs at 11 p.m. Thursday on Comedy Central to find out who made the guest list or was just in the audience to support their friend.

Comedian Louis C.K. appeared as Stewart's final announced guest Wednesday. C.K. also has a show on Comedy Central and the two discussed the comedy scene and the art of the craft. "On behalf of comedy ... nice job," C.K. said to Stewart.

Stewart became the host of "The Daily Show" 16 years ago. The show drew in about 1.6 million viewers a night at the height of its popularity during the 2008-2009 season.

South African comedian Trevor Noah has been announced as Stewart's successor. He will take the seat in September.