This is the first time that we get to see Kevin McHale dance. Zachary Woodlee, the show's choreographer, had said that he was pretty sure that Kevin was the best dancer out of the original six Glee Club members, but was ironically the one in the wheelchair.
Early in this episode, Rachel (Lea Michele) tries to convince herself that Broadway star Patti LuPone is her birth mother. Later, Rachel and Shelby (Idina Menzel) sing a duet of "I Dreamed a Dream," Fantine's most prominent song from the musical 'Les Misérables'. Patti LuPone created the role of Fantine in the original London production of 'Les Misérables'; as a child, Lea Michele played Young Cosette and Young Éponine in the original Broadway production of 'Les Misérables', and she sang the role of Adult Éponine for a 2008 Hollywood Bowl concert production. Michele was asked to take the role of adult Éponine in the 2006 Broadway revival of 'Les Misérables', but she chose instead to stay with 'Spring Awakening'. In keeping with the theme of the episode and Rachel's search for her mother, the character of Fantine is one who had to give up her baby daughter and is haunted by it.
Rachel thinks that two of her potential mothers Bernadette Peters and Patti LuPone. Both have played Rose in the musical Gypsy. In the previous episode, "Laryngitis", Kurt sings "Rose's Turn", a song from the musical.