There's a lot of stuff filmed outside the studio though I'm certain they don't have a live audience for. The IT Crowd does use a laughter track a lot of the time.
Yeah, they film those parts before the live recording and then show them on a screen to the audience to get reaction audio, and also so the audience has context for later live scenes. It's a surprisingly involved process.
There's a lot of stuff filmed outside the studio though I'm certain they don't have a live audience for. The IT Crowd does use a laughter track a lot of the time.