The last 300-400 feet (about 3-4 minutes), which is the big musical finale, was filmed in two-strip Technicolor, is missing from surviving prints and is apparently lost.
The on-screen credit for Nacio Herb Brown, Arthur Freed, Felix E. Feist, George Ward and Reggie Montgomery was for "interpolations", which meant song insertions at the time the movie was released. However, no song by Felix E. Feist was heard.
The original musical comedy opened in New York on 6 September 1927 and had 551 performances. The opening night cast included Gus Shy and 'Mary Lawlor', both of whom originated their movie roles in the play, and Inez Courtney as Babe and John Sheehan as Pooch. The 1975 revival starred Alice Faye as Professor Kenyon!
There is conflicting information for the original (1927) song credits. Some references list music by Ray Henderson; lyrics by Buddy G. DeSylva and Lew Brown. However, sheet music published in connection with that show, and the 1947 movie list all three for music and lyrics. The on-screen credits also lists all three for music and lyrics.