During the scene (Storm Scene on the way to the Navarone cliff) where Gregory Peck & Anthony Quayle are on the ship's bridge discussing what happened when they were boarded by the German E-Boat crew, Peck mentions "Butcher" Brown's failure to kill the German soldier. He clearly says "I think our friend Baker has some explaining to do."

Now the character of Brown was played by Stanley Baker, I'm not sure if this was an error that was just missed in post-production or was noticed & left in hoping that no one would notice.