Mumford is listed with the first name 'Jeff' throughout the show. But both Cortez and Hicks several times at the end of the episode address him as 'Jack'. Which gives this episode's title a double meaning. Also, in episode #2.19 (Invisible), his wife Nikki calls him 'Jack'.
Detective Schumacher, of the auto task force, is named in reference to Michael Schumacher, famous F1 driver.