In the opening, Kurt performs "Single Ladies (Put A Ring On It)" by Beyoncé Knowles with Tina and Brittany as backup dancers. Heather Morris, who plays Brittany, was a back-up dancers for the "Single Ladies" performance with Beyoncé Knowlesat the 2008 American Music Awards. Morris was actually a back-up dancer for Beyoncé for a year and a half between 2007-2008, and performed live with her for "Single Ladies."
Rachel believes she should get the solo in 'Tonight' because she identifies with Natalie Wood. Wood, however, did not do her own singing in the film of West Side Story (1961) - she was dubbed by Marni Nixon.
When she reveals to her sister that she has a secret about the baby, Terri's (Jessalyn Gilsig) sister says "Oh my god, is the baby black?" Jessalyn Gilsig also played in Ryan Murphy's Nip/Tuck (2003) as Gina Russo, the woman who gets pregnant by Christian Troy (Julian McMahon). In the season 1 finale, Gina gives birth to an African American baby, proving that it was never Christian's child.