Diane Farr joins the cast as the precinct's first female firefighter. Callie Thorne was originally in line for this role before she took the part of Sheila.
In this episode, Denis Leary wears a shirt that bears the name Garnet "Ace" Bailey with his number and picture. Bailey was the lead scout for the Los Angeles Kings who was killed when Flight 175 flew into the World Trade Center on September 11th.