There was a musical number where Kim Manning and the dancing crew performed and danced "New York, New York".
Narciso Ibáñez Serrador didn't like the matte look of the stage floor, so he decided to spring water onto it to make it look glossy. It was a huge mistake, as dancers kept on slipping and falling during the choreography. There were so many falls and slips during filming that some of them ended appearing in the final cut, as it was literally impossible to find some takes without at least one of the dancers in the background slipping.