Because some of the lyrics to the song "Cotton Blossom" have been altered by uncredited staff writers in this version of "Show Boat", Oscar Hammerstein II is never actually mentioned as having written the lyrics to the songs, although P.G. Wodehouse IS listed as having written the lyrics to "Bill". (This is only partially correct; only about half of Wodehouse's 1917 lyric to "Bill" was used. The rest of the lyric is by Hammerstein.)
Jerome Kern is never specifically credited for having composed the music. His and Oscar Hammerstein II's joint screen credit reads: "Based on the Immortal Musical Play 'Show Boat' by Jerome Kern and Oscar Hammerstein II'", although Kern wrote only the music.