 O'Brien also made a cameo appearance on the U.S. version of "The Office".In the episode "Valentine's Day", Michael believes that he spots former "SNL" cast member, Tina Fey, but has actually mistaken another woman for her.In the meantime, Conan has a quick walk-on, and the camera crew informs Michael when he returns from talking to the Tina Fey lookalike.