If you are wondering who?, you aren’t alone. O’Connor has been making movies for more than a decade, mostly in his home country. His public profile has steadily increased in recent years, partly because of the dominating influence of Netflix, home to two of his wider-seen vehicles — “Wake Up Dead Man” and the royal soap “The Crown.” O’Connor acknowledged the relative novelty of his celebrity last month when he hosted “Saturday Night Live.” During his monologue, he warmed up the room with affable self-deprecation. “For those of you who know my face but maybe can’t quite place me, no, I am not the mouse from ‘Flushed Away.’” The show briefly cut to an image of the rodent hero from that 2006 animation.