Character mistake: Hicox salutes General Fenech, who returns the salute. But Fenech is bareheaded and therefore under British military protocol cannot salute. He would instead acknowledge the salute with a nod.
Character mistake: Hicox uses the word "momentarily" in the American sense of "in a moment". In British English it means only "for a moment". An educated Englishman in the 1940s would never have used the word in the American sense.
Answer: Based on his willingness to join the Basterds, we can assume he killed them because he didn't believe in what the Nazis were doing.
There is a cut of him being whipped during the bar scene. I think he was taking revenge for harsh and perhaps undeserved punishment.
No, the whipping is how it feels in his mind sitting next to that SS officer and having to pretend to like him and be a Nazi. He's ready to snap.
lionhead