Marjorie Silcoff works just as much as any of the other cast members, appearing throughout the show, yet her name fails to appear in the credit roll.
When Todd and Alasdair are talking about Clarabell Corrigan, Todd is looking a little up and to his far right at Alasdair. When the camera cuts to a closeup, he's looking mostly ahead, down, and only a little to his right.