Typical of this period was the tolerance given to interpolations into what was nominally a book musical. This was especially true when Al Jolson was the star. Audiences came to his shows not to see a musical play, but rather a Jolson 'extravaganza'.
While based on the best information available, no claim is made that the list of interpolations is complete. Many songs were used only briefly and many did not appear in programs. Traced interpolations are listed alphabetically.