Revealing mistake: When the black singer of the band of the nightclub can't perform, Dewey steps up to prove his worth. When he starts getting really into it, he joins the piano player in playing some tunes. You can see some keys playing, but they are not being touched by either person. (00:20:50)Knever
Ma Cox: I'm just so glad you learned to play the guitar so good... even without having a sense of smell.
Dewey Cox: It's okay mama, I learned how to play by ear.