Jon Foster who portrays Dustin Shepard, Michelle Blake's (portrayed by Liv Tyler) lost sister's boyfriend, is Liv Tyler's real life brother-in-law.
In firefighting lingo, Alpha, Bravo, Charlie, Delta, are terms are used to designate the sides of a structure.
- "Alpha" refers to the front side of the structure
- "Bravo" refers to the left side of the structure,
- "Charlie" refers to the back side of the structure
- "Delta" refers to the right side of the structure
The episodes about the runaway tank in a downtown area and the cell-tower sniper are based on true events. Ex-Army officer Shawn Nelson stole a tank on May 17, 1995, and destructively rampaged it through the streets of San Diego. Cell-tower workers' being shot at by citizens who were disgruntled with cell phone companies and/or opposed to the presence of cell towers in their neighborhoods has been an issue recently.
This series is the second time Billy Burke has portrayed a Firefighter Captain. The first time was 16 years earlier in Ladder 49 (2004) by Touchstone Pictures and distributed by Buena Vista, both units of the Walt Disney Company, and starring Joaquin Phoenix and John Travolta.
The regular series character of Paul Strickland is an out black trans man. Strickland is portrayed by Brian Michael Smith, also an out black trans man, the first out black trans man in a series regular role.