Oliver Stark was considering quitting acting and becoming a firefighter before getting cast as one on 9-1-1 (2018).

After two episodes aired, Fox renewed 9-1-1 (2018) for a second season, announced on January 16, 2018.

One episode begins with a wedding party that ended in a catastrophic building collapse where the floor gave out under the weight of all of the party goers (9-1-1: Point of Origin (2018)). This is based on an actual event that occurred in Israel where 24 people lost their lives as a result of a floor giving out due to poor or improper building materials used during construction.

Jennifer Love Hewitt (Maddie Buckley Kendall) and Brian Hallisay (Doug Kendall) are married in real life with three kids. They also previously starred as husband and wife in the show The Client List (2011).

Athena Grant's badge number is 1275, a reference to I-275, the freeway that runs through Angela Bassett's hometown of St. Petersburg, Florida. Grant's unit number is 727-L-30; 727 is St. Petersburg's telephone area code.

Both Angela Bassett and Aisha Hinds have portrayed Voletta Wallace, the mother of The Notorious B.I.G.: Bassett in the film Notorious (2009) and Hinds in the limited series Unsolved: The Murders of Tupac and the Notorious B.I.G. (2018).

Even though it wasn't disclosed to the public at the moment of airing, Connie Britton was always going to sign only for the first season, because she hasn't wanted to commit to a multi season contract after Nashville. She basically did it as a favor to co-creator Ryan Murphy, who she loves working with.

Vocabulary: Emergency Board Operator (EBO)- Receives and processes telephone requests from citizens. A 911 dispatcher must make independent decisions, which affect the safety of police officers, and the community, which includes determining the urgency of requests received and the appropriate actions to take. A 9-1-1 dispatcher averages 75-250 calls per shift. Bureau Communications Coordinator (BCC)- Oversees and monitors all activity in a specified police bureau including urgent field situations and officer emergencies. Networks with outside agencies. Radio Telephone Operator (RTO)- Dispatches patrol units using radio, digital terminal and other methods in accordance with urgency of requests for service. A single operator can be responsible for as many as 50 units Auxiliary Telephone Operator (ATO)- Processes calls for alarms, outside agencies as well as requests from field units for additional information or resources. Instant Recall Recorder (IRR) - Records audio from telephone and radio allowing users to play back conversations on the fly. National Traffic System (NTS) - is a network of amateur radio operators sponsored by the American Radio Relay League for the purpose of relaying messages throughout the U.S. and Canada. CL ma6y indicate that a station is going off or leaving the air, and will not listen for any further calls. CL is sent after the final Identification.

In episode two, Hen invites Athena to the fire station and tells the crew that she has family issues and needs some TLC (Tender Loving Care). In the same episode, TLC's No scrubs can be listened to while Athena drives her patrol. Another time, Athena tells Buck not to go chasing Waterfalls, a clear reference to TLC's Waterfalls.

Angela Bassett and Connie Britton both appeared on American Horror Story (2011).

Rockmond Dunbar and Kenneth Choi appeared on Sons of Anarchy (2008) together. Dunbar played the new Sheriff in Charming and Choi played Chinese gangster Henry Lin.

Every time the plot of an episode is about how one of the main characters found their career path, the episode is titled that characters first name followed by the word begins. For example, 2.9 is titled Hen Begins, 2.12 is titled Chimney Begins, 3.7 is titled Athena Begins, 3.15 is titled Eddie Begins and 4.5 is titled Buck Begins.

Oliver Stark confirmed via Twitter on January 31, 2018 that despite being ordered for a 13-episode first season, 9-1-1 (2018)'s season one will have only 10 episodes.

Connie Britton and Kenneth Choi both appeared in Ryan Murphy's American Crime Story (2016) . Courtney B. Vance starred in first season of Ryan Murphy's other project American Crime Story (2016)(People vs OJ Simpson), is married to 9-1-1 (2018) co-star Angela Bassett.

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

Radio Assignment of Police Radio Car: For example - 1Adam12 (1A12) - 1 is indicative of Central Division; Adam or A shows that the car is a two-officer basic patrol unit; and the number 12 is the unit number or beat assignment. L: One officer patrol unit. ("Lincoln"); ( "X" or "T" units shall use the letter "L" following the regular service letter when applicable.):traffic supervisor, TL units usually carry the rank of Sergeant

Kenneth Choi and Angela Bassett both appeared in Marvel movies. Angela Bassett appeared in Black Panther (2018). Kenneth Choi appeared in Captain America: The First Avenger (2011) and Spider-Man: Homecoming (2017).

Established in 1969 by combining the once separate Robbery Division and Homicide Division, today's Robbery-Homicide Division is comprised of approximately 110 sworn and civilian personnel . RHD is comprised of five sections (Robbery, Homicide, Special Assault, Cold Case Homicide, Gang Homicide, Special Investigation Sections), each under the supervision of a lieutenant and tasked with investigating or providing surveillance support for a wide variety of select crimes that are often high profile in nature. The purpose of each unit is more or less self-explanatory, except Special Assault, which is sex crimes. The remit of the division is city-wide, as oppose to the precinct level.

In the United States, an "open carrier" ( also known as a "open microphone", "keyed microphone", or "open radio") is police parlance for a radio that has been inadvertently left on in Talk/Transmit mode. An open carrier stalls and paralyses broadcast traffic, leaving so-called "dead air" to reveal sudden gaps, smudges of hiss, gently swaying drones, beeping alerts, fragmented words, quick phrases, recessed conversations, and other unexpected artifacts. It's like butt-dialing everyone who is listening to the radio.

Jennifer Love Hewitt's character (Maddie Kendall) cries in almost every episode.

EBO is short for Emergency Board Operator.

Firefighting Lingo: On-scene - means that a unit has arrived at the scene of the emergency Staging - means that a unit has arrived on the scene and is standing by awaiting an assignment from the Incident Commander. Staging Area - an area where on-scene resources can assemble while awaiting an assignment.

BCC, as in Valley BCC, is short for Bureau Communications Coordinator.

First broadcast on Italian TV will be on January 9th 2019 (9-1-19), a palindrome of 9-1-1.

Some of the screens (frequently used resources within arm's reach) overseen by a 9-1-1 dispatcher , also known as call-taking workstations include: Location Map (includes GIS and GPS/AVL capabilities which can located the caller and the first responder respectively; GIS is short for Geographic Information Systems; GPS is short for Global Positioning System; AVL is short for Automatic Vehicle Location) Dispatch Activity (Computer Aided Dispatch or CAD) Call list (call queue set-up can distinguish emergency calls from non-emergency calls for faster response times on critical calls) Radio Dispatch Consoles First Aid Treatment Database

In Police Tactical circles, the methodology to clearing a house or room, breaks down as follows: The main entrance is designated number 1. The other sides of the house are label 2,3, 4, etc. in a clockwise manner. The corners where the sides meet are indicated by designated numbers joined by a forward slash in the middle ex: 1/2, 2/3, 3/4 etc.

In the Los Angeles Police Department, there is a Special Investigation Section, which is a tactical surveillance unit formed in 1969 to apprehend robbers and burglars. The section is part of the Robbery-Homicide Division.

A "Silent Code" or a "Silent Run" is defined as a response to an "emergency" situation that requires silence so as to avoid alerting the suspect to the police response.

In some of the promotional material for the show, the interchange for the confluence of the 110 and 105 freeways is shown in the foreground.