This painting was first exhibited in the Spanish Pavillion at the 1958 World's Fair in Brussels. After that showing Dali made some changes to the work so that it would be more 'socially' and most likely 'ecclesiastically' accepted. One judgement of the work was that a married woman, such as Gala, (dressed as a peasant in the lower right corner) could not share a canvas with Jesus (on the horse). Another detail, since changed, were the exposed genitals of the horse.
The human leg and foot shown dangling from the horse is Dali's own. Apparenly, he thought his foot to look quite princely.