While his interrogator was temporarily distracted, he hid his microphone and mini tape-recorder -- used to record dialogue -- in his sock.

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It wasn't the time-consuming graphics that took the greatest toll, nor the need to re-record a lot of the dialogue.

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All sorts of beautiful touches supported the well delivered dialogue: from authentic props such as the record player to the subtle lighting design that evocatively suggested the rising daylight that beamed into Frankie's apartment.

BBC: By Wilf Arasaratnam