The Office 9 p.m., Channel 7

What the what? “The Office” is beginning its final length with a peek behind the cameras, as we meet the filmmakers of the documentary that is “The Office.” Last week, they jumped in to protect Pam from an attack, and one of them, Brian, got fired for it. Clearly, there is chemistry between Pam and Brian, who has been watching her for years. On Thursday night, Jim and Pam socialize with Brian, which is bound to be awkward. Does this meta approach work? So far, yes, kinda. Pictured: John Krasinski as Jim and Jenna Fischer as Pam.

Community 8 p.m., Channel 7

The show that critics love, but very few viewers watch, but those who watch have come to worship, even though it’s always teetering on the brink of cancellation, and even though Chevy Chase was always badmouthing the writing until he got fired, and even though NBC replaced showrunner Dan Harmon at the end of last season, is back. Pictured: Joel McHale as Jeff and Yvette Nicole Brown as Shirley.

Happy Days 9 p.m., Hallmark Channel

The Jump the Shark episode. Really.

Rehab Addict 9 and 9:30 p.m., HGTV

“I want a wall, I want a wall.”

Late Show With David Letterman 11:35 p.m., Channel 4

Sally Field campaigns for No. 3.