Apparently the bar scene took seven or eight takes and the director insisted real beer was used for realism. There are some more than amused twinkles in various eyes in that scene, just as there is (to my eye) a hint of resignation in the way JM downs his glass. The trick in that scene, as in Lord Flasheart's dramatic entrance in Blackadder is not to watch the principal actor but to study the rest. Their faces tell a story. Priceless!