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Many sitcoms are recorded in front of a live audience who provide the laughter track. Now this is simple enough in most scenes. But some scenes require added special effects. For example the dinner scene in Red Dwarf season 6 episode "Legion". Part of the comedy is the food hovering in the air, and part of the drama is the reveal of Legion's face as an amalgamation of the cast's faces. You can't do that live, and it has to be done in post production.

So how is that sort of scene filmed in front of a live audience?

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if it was an episode from series 7, it wasn't shot in front of a live studio audience. Series 1-6 and series 8 were shot in front of a studio audience. – Ben Plont Sep 20 '13 at 22:40
@BenPlont - Wikipedia says it was from series 6. – System Down Sep 21 '13 at 15:32
Then, I would assume they did it similar to the Bodyswap episode mentioned in the answer @Tom77 wrote. – Ben Plont Sep 21 '13 at 15:37
up vote 3 down vote accepted

From the Wikipedia entry for the Bodyswap episode:

This was the first episode to be recorded without the live studio audience. Technical difficulties of the actors playing other characters meant that the scenes would have to have been done twice. Instead the voices were dubbed over the scenes in post-production and trying to match up with lip movements caused much mirth while recording. Chris Barrie, being an impressionist, had no problems playing Lister, whereas Craig's portrayal as Rimmer was not as smooth. The final edit, with dubbed voices, was then played to a small audience to provide the laughter track.

This is a common technique for scenes that can't be recorded with a live studio audience:

In the 20th century, most U.K. sitcoms were taped before live audiences to provide natural laughter. Scenes recorded out of doors, traditionally recorded in advance of studio work, are played back to the studio audience and their laughter recorded for the broadcast show.

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This doesn't answer his question about how special effects are applied. The question is how are scene with special effects shot in front of a live studio audience. – Ben Plont Sep 21 '13 at 15:21
@BenPlont I think the answer seems to be 'They may seem to have been filmed in front of an audience, but that is not the case. The laugh track is coming from a replay of a prerecorded scene.' – Andrew Thompson Sep 22 '13 at 11:14

I was in the live studio audience for the taping of a sitcom maybe 15 years ago when I was living in southern California. There was a scene that couldn't be done live (no special effects; I believe it was just a scene outdoors). It had obviously been taped beforehand. The regular "set" consisted of the interior of a house -- laid out horizontally so each of the rooms had one wall missing, all facing the audience.

Scenes for "live" sitcoms are taped in chronological order, otherwise the audience would get pretty confused. (Sometimes if the actors made a mistake, they would have to redo the scene. The hard part then was to get the same reaction from the audience -- if they didn't I imagine they had to "fix" it during post-production.)

When the outdoor scene came up, they stopped the action on the set, dimmed the lights, and played the scene on several large TV monitors spaced across the front of the full audience. (In fact when I first sat down, I was wondering what those were for.)

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