Co-creator Chuck Lorre admits to a huge Penny mistake in the earlier seasons of . After the original pilot was reworked, Kaley Cuoco was brought in to play Penny, Sheldon and Leonard's new neighbor. For the first three seasons of the sitcom, Penny was the only main female character in the show, and she ultimately ended up appearing on all 12 seasons of the beloved CBS comedy.

Unfortunately, Penny being an original cast member also meant that she was subjected to

's problematic brand of humor, which was especially prevalent in its first few years. Even Simon Helberg agrees with the , while reruns cut a particularly distasteful scene from the sitcom's pilot. In terms of Penny, the character was depicted as the stereotypical ditzy blonde - something that Lorre now regrets.

Looking back at the show's history in the new book Lorre candidly admits their mistake in Penny's depiction during the first few years of the show. As Cuoco previously mentioned, she felt like her character was overly sexualized in the early years of the show. Luckily, as it went on, she became more involved in the choices for Penny. Read Lorre's full quote below:

One of the most underwritten characters in the show early on was Penny.

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