Holmes spends much of the episode worrying about Watson's ability to defend herself, ironically, Lucy Liu is a Black Belt in Wushu and has practiced multiple forms of martial arts since she was a child, so would be more than capable of defending herself. (Although, thankfully, she has never had to use her skills anywhere but on-screen.)
Malcolm Goodwin plays a criminal in this episode and the brother of detective Bell. In the show iZombie, he plays a detective.
Malcolm Goodwin plays a criminal in this episode and also on Breakout Kings.