I could see it being over an hour--I guess--in rehearsal, but, as much as you hear about endlessout of town tryouts of Show Boat and Camelot--I stand byt my initial thought, there's no way an hour long ballet in Act II made it into performance and then within weeks was edited down to a ballet that ran only about 10 minutes (shorter than the previous Oklahoma! ballet.)
DeMille did like using flat footed ballet steps for her women--except for more stylized sections. Notably in the original Louise ballet, she wears flats for the pas de deux (in the film they have her bare footed) and it's only the "carousel horses" girls who are lifted in stylized poses who have toe shoes (they seem kinda similar to me to the "Pin-Up" girls in the Oklahoma! ballet.) But that's not really unheard of for ballet--a lot of Dhiaghilev's Ballet Russes's didn't use toe shoes or pointe (which was the tradition DeMille and early Ballet Caravan/Ballet Theatre came from), and of course back with the great Petipa/Tchaikovskly Russian ballets, as more faithful productions show, a good deal of the female chorus would wear flat character shoes, the pointe shoes only used to distinguish the upper level of the female dancers.
StageStruckLad--I think it was just edited for the concert? The ballet I believe starts off (with some dialogue from Billy over) with Louise entering to a variation of the "My little girl" section of the Soliloquy, then I believe that goes basically abruptly into a slightly discordant version of the Carousel Waltz--the pas de deux proper, when the rest of the dancers have left is to If I Loved You.
Here's the film version (with Jacques D'Amboise) which as mentioned is DeMille's choreography but was used uncredited and so she took up a lawsuit (you do notice how poorly it's filmed--the ballets for the film of Oklahoma had, much to Rodgers annoyance, DeMille supervising the filming and dictating camera angles--and come out much much better.)
http://www.youtube.com/watch?v=ZYY6DhNGJAk It's virtually the same music as used for Kenneth Macmillan's version in 1993/94
http://www.youtube.com/watch?v=60gstVHOnyE