Mayim Bialik had little knowledge about The Big Bang Theory before being cast as Amy. She developed a strong relationship with the cast, especially Kunal Nayyar. While her chemistry with Jim Parsons was special, she had insecurities behind the scenes about her portrayal of Amy.
Initially, the show wanted a female version of Sheldon for Amy's character, but she evolved into her own person. Bialik found it challenging not to be the female version of Jim Parsons and worried about her performance. Despite feeling inadequate at times, she had great chemistry with Parsons. Bialik believes their success came from both of them not being overly sentimental. Filming the final scenes was emotional for Bialik, Parsons, and the rest of the cast.