As a way of bypassing the Production Code (i.e. censors), MGM created "Premiere Productions". This was a dummy company which had no agreement or affiliation with the Production Code and, therefore, did not have to adhere to its standards. MGM did not have to cut the full frontal nudity or other sexually explicit scenes and maintained all rights to the film. When the film opened to rave reviews and excellent box office, this defeat was considered the final blow for the Production Code's credibility and was replaced with a ratings system less than two years later.
Thomas' workhorse camera was the then innovative Nikon F, the world's first 35mm SLR with full coupling of shutter and aperture with its exposure meter. Even though the particular model had been around since 1959, the glamorous publicity it received in the movie generated an unprecedented enthusiasm among camera buffs, professionals and amateurs alike.
According to Don McCullin in his autobiography "Unreasonable Behaviour", director Michelangelo Antonioni was unhappy with the color of the grass in Maryon Park. He had it sprayed green so he could re-shoot the scene.