Gregor/Nehamkin: Error?
Minor Spoiler:
In the opening of the film, Boris tells us about "Old Gregor" who is somehow younger than "Young Gregor." This, like most of the film, is a flashback told from when he awaits execution. Later in the flashback before the double for Napoleon is killed he pauses and mentions how life is illogical, or else how could there be something like Old Nehamkin being younger than Young Nehamkin.
But soon after we are introduced to the Gregors we are told of the death of "Old Nehampkin" who is struck by lightening. We see him, and he is not the same person as either of the Gregors.
In the fiction of the film, this the same flashback, so you'd think Boris would be able to get it right.
It can't be explained by saying they are Old and Young "Gregor Nehampkin" since again, we see that Old Nehamkin is a different person from either of the Gregors.