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The Weatherfield show was broadcast live every Friday during its early months on screen in 1960 and 1961. Following each Friday night airing, the show's cast would immediately pre-record an episode due to air on Wednesday the following week.
Speaking to The Sun, Warren commented: "There's an edge to it that you only get with live. If you go back to the earlier episodes you can tell that it hasn't quite got the tension or edge in that pre-record.
"It was always like that during the first year - one, two, one, two - none of the even numbers were ever quite as sharp."
He continued: "After one live episode an actress forgot she was needed for the second one and went off to the local YMCA. She had gone swimming stark naked. Someone had to go and fish her out for the recording. If you look at that episode you'll see she's got wet hair."
On December 9, the programme will attempt a live transmission for the first time in ten years as part of its 50th anniversary celebrations. The episode will focus on the aftermath of the soap's tram crash disaster.
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