Jeni Le Gon with The Four Blackbirds are in studio records/casting call lists as cast members, but they did not appear or were not identifiable in the movie.
The print Turner Classic Movies (TCM) has been showing since 1994 is probably a print shown in the UK, since an opening frame states "Grand National Pictures Ltd. presents Start Cheering". That company is a UK company which probably handled the UK distribution. Although the IMDb credits are based on that print, it differs markedly from the American version as listed in the AFI Catalogue.