“Stumble,” a new sitcom that premiered last week on NBC, takes Greg Whiteley’s great docuseries “Cheer,” about competitive cheerleading, runs it through “The Bad News Bears” and frosts it in the mockumentary style of “The Office,” et al. You know the drill — characters doubly conscious of the scene they’re in and the camera that’s watching them, cutaway interviews commenting ironically on the story, a camera that catches odd events around the main action and a broken fourth wall that puts the viewer in the room. It can seem an overused device, but it often produces good results, and, based on the two episodes out for review, the results here, rich in slapstick and silliness, are very good. I laughed a lot, anyway.

Jenn Lyon plays cheerleading coach Courteney Potter, and the actor has clea

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