Corrected entry: When Bob and Phil sub in for the girls during their "Sisters" number at Novello's in Florida, they have only heard the song performed once and we are supposed to believe that they memorized all of the lyrics? Also, in the same scene, there is an "ooh!" after they sing the line "the same in the rain or sun." Obviously, the men are lip-syncing to a recording made by the Haynes Sisters, but the sisters' live performance did not contain the "ooh!" so how did Bob and Phil know to do this?
Corrected entry: When Wallace and Davis arrive at the night club to check out the Haynes Sisters' act, their only words to Novello, the maitre d', are to the effect of "We're here to catch the Haynes Sisters' act. Tell the girls we're here." However, when Novello goes to their dressing room, he says something like, "Wallace and Davis are out there to catch your act. Your brother Benny is an old Army buddy and wrote them a letter." How did he know? No one told him that.
Corrected entry: Wallace and Davis escape from the sister's show room, out of the window and get a cab. As they are in a rush they don't take anything with them. However, then at the station when catching the train they have all their luggage. How did they have time to get their luggage in such a rush?