Regarding the 'sweet potatoes' that Gary Cooper and Walter Brennan play, in addition to "Hi Diddle Dee Dee (An Actor's Life For Me)", from "Pinocchio": Brennan alone plays this on an ocarina (sweet potato), but Cooper plays a small harmonica. The tune they play as a duet, while Barbara Stanwyck is interviewing them, is The "William Tell Overture, Finale" by Rossini (The Lone Ranger Theme). Cooper explains the reason Brennan likes him is that they both play 'Doohickeys'.