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• Goof (revealing mistake): The door to Penny's apartment on the fourth floor is directly above the building's street entrance on the ground floor. This would mean that her apartment, and the ones above and below hers, are floating out above the street.
• Penny was an add-on from a different sitcom concept. She had been originally envisioned as Katie, a more cynical, hard-drinking, streetwise girl who worked at a makeup salon. In the original unaired pilot, she was played by Amanda Walsh.
• Goof (factual errors): The opening titles are based on a time line of human history. A picture of Abraham Lincoln is followed by a picture of George Washington.
• Raj's inability to talk to women except when drunk is based on an old coworker of executive producer Bill Prady when he worked at a computer company.
• In fall 2010, Kaley Cuoco revealed to "CBS Watch! Magazine" that she and her "Big-Bang Theory" co-star and love interest Johnny Galecki had secretly dated for two years earlier in the run of the show, but they were no longer toget