Revealing mistake: In the scenes in the cockpit, when Kareem Abdul-Jabbar (Murdoch) is talking, you can see his eyes move back and forth like he's reading from a cue-card.
Revealing mistake: When the doctor is removing the eggs from the woman's mouth, he actually has them in his hand, not taking them out of her mouth. A simple sleight of hand, but still noticeable.
Chosen answer: All of his questions to Joey are filled with homosexual innuendos; the perverted captain is trying to see if Joey has any such tendencies. In a Turkish prison, men who are sexually frustrated will resort to "companionship" with other men (even forcefully). Movies about gladiators depict ripped, muscular men, and the question about seeing a "grown man naked" obviously fits the pattern.
Matty Blast
The gladiator reference is about Spartacus. There is a scene in there about homosexuality.
What scene are you talking about? If you mean the "snails and oysters" scene, that was not part of the movie until it was restored in 1991.