Because Peter O'Toole and Omar Sharif were being held to contracts signed several years earlier, when they were less famous, they both had to accept smaller fees than one would expect, given how famous they were when the film was made early in 1966. Neither was very happy with this situation, but they took care to claim the lavish living expenses to which they were entitled.
The film maker Yves Boisset says in his memoirs that, on the set, Peter O'Toole arrived totally drunk for a scene, but finally made it perfectly, before getting back to his alcoholic condition, unable to even stand up.
According to one of Sam Spiegel's biographers, the fee paid to Donald Pleasence was more than double the combined fees paid to Peter O'Toole and Omar Sharif, although they had higher billing. This was due to their having to fulfill an old contract agreement dating from before their world fame.
The film was one of the last to run into heavy censorship trouble before the abolition of the Production Code Administration and its replacement with the voluntary ratings system (G through X) by the Motion Picture Association of America (MPAA) in 1968. According to former PCA Director Geoffrey Shurlock, this film was troublesome due to its depictions of sexual behavior, which the producers tried to get away with by using silhouettes and shadows.
The DVD version includes multiples erroneous subtitles in English that don't match the spoken dialog. E.G. 1:29:24 Maj Grau speaks of looking for a general that thinks "he could play God in bed as well as in battle." The subtitle indicates "he could play God in bed he could play God in bed".