Why did the producers decide to shoot a second pilot episode?

Answer The first one wasn't funny enough

Producers didn't hear enough laughs coming from the studio audience viewing the first pilot. In fact, audiences were so turned off that the pilot was the lowest-ranked television episode in CBS history. Polling revealed the main problem: Rhoda was coming off more nasty than amusing. After a speedy rewrite, the second pilot was a (hilarious) success.

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