I think it's more 'limited choreography'. Hermes Pan was great with real dancers, but only had Bobby Van in that category to work with in the cast of this film. Personally, I think it's one of the better songs in the score. The lyrics and staging of 'LIving Together, Growing Together' make me cringe far more (though the re-instated Vegas-syle dance number with the mostly non-Eastern- looking bodybuilders is laugh-inducing. Good editing and cinematography nonetheless).
I think if you were a fairly undiscriminating teenager with a love for musicals and/or movies when this came out, this movie will always hold a special place in your life/heart/memory/'Guilty Pleasures' list. Here in Australia it was heavily advertised and I remember reading an article in the newspaper heralding the fact that audiences were ignoring the critics and flocking to the movie. It broke a house record in the Hoyts Mid-City complex on its first week of playing. It did look great in 70mm. Our prints here were the shortened version so the slower songs which bring the film to a dead halt ("Where Knowledge Ends", "If I could Go Back") were mercifully excised. Do trivia-lovers know that Ross Hunter used another former FLOWER DRUM SONG cast member in this film? The woman being celebrated for her new motherhood status is portrayed by Virginia Ann Lee, who played the older girl who performs The Other Generation with Patrick Adiarte (the 'groovy' brother of the character played by James Shigeta, who is in this number. He was also the Crown Prince in THE KING AND I , to get-slightly- back on topic). Another Asian actress- Miiko Taka- who made a splash in the '50's as Brando's lover in SAYONARA (who Joshua Logan reportedly later regretted casting) plays a small role as a nurse in the hospital where Peter Finch recovers in the penultimate scene.
Some fans may not know that Charles Boyer- who I think is quite effective in his role, making the dialogue sound better than it really is- sadly took his own life in a state of grief soon after his wife died in 1978. He only made two more movies after LOST HORIZON, his last being Minnelli's ill-advised final motion picture (though no doubt loved by a devoted few) A MATTER OF TIME. A kind-of reunion movie with his GASLIGHT co-star Ingrid Bergman.
Final note, I believe at one stage Liv Ullman refused to let interviewers bring up this movie in their questions. If more critics had agreed with Julian Fox's FILMS AND FILMING review, this never would have happened (Did he keep his job?)