A few observations......
First, about the movie, I haven't seen it yet but everytime I see that smiling mask it makes me think that there's some kind of inside joke going on that the views aren't being let on to. Not quite sure what the Greeks would have called it, but with all the other characters acting so serious and the main character always with a smirk on his face makes me feel as if there's some kind of trick or pun being played on us.
Second, at the time of the "Gunpowder Plot" were there really politicians as we know them today? Certainly there were those people who wanted to seize power, for whatever reason, so I can see killing the King, but not the members of Parliament.
Now for a question, and correct me at anytime if I''m wrong, today Parliment is made up of two bodies, The House of Lords (rements of English nobility) and the House of Commons (elected officals choosen to represent the people). At the time of the "Gunpowder Plot" did the House of Commons exist?