The character of Hank Hill is based on a character in Mike Judge's Beavis and Butt-Head by the name of Tom Anderson who acted and talked exactly like Hank. Also Hank's catchphrase of "That boy ain't right" was from an episode of "Beavis..." when they're at Burger World and Tom Anderson comments on Beavis by saying "That boy ain't right in the head."
Bill's full name, with military rank, is Sgt. Barber William Fontaine Delateur Dauterive. He stands 5' 8-3/4" and was born in Louisiana, or "Loser-ana" as Dale described it.
The school which Bobby Hill attends, Tom Landry Middle School (named after the Dallas Cowboys football coach), really does exist. It is located in Irving, Texas in the sub-division of Valley Ranch, just a few blocks down MacArthur Blvd. from the Dallas Cowboys' Office and Training Facility (most of the streets in the neighborhood are also named after Dallas Cowboy greats).
The license plate on Hank Hill's pickup truck is JD3-170.
Kahn's license plate reads "KINGKAHN".
Stephen Root was uncredited during the first few seasons. This was because he was also on NewsRadio and his contract prevented him from being credited on another network's show. After the show was cancelled in 1999, he was able to be credited for "King of the Hill".
The Hills' dog is named Lady Bird after Lady Bird Johnson.
Hank, Bobby, Peggy, Luanne, Bill, Dale, and Boomhauer were animated into an episode of The Simpsons. At one point, Homer makes a reference to the Springfield football team playing the Arlen football team, then, the shot goes to the Hill family, where Hank says "We came two thousand miles for this?" The rest of the characters do not speak. In an episode of King of the Hill, Bobby also has a Bart Simpson doll on his bookshelf.
A 1999 episode "Death and Taxes" has a death row inmate named "Wesley Martin Archer." Bobby comments that it's a good name for a killer. This episode is directed by Wesley Archer.
The Luann Platter is a type of combination plate available at Luby's Cafeteria, a popular restaurant in Texas (In the show, it's referred to as "Luly's"). It has a meat, a roll, and a side for a low price.
Dale Gribble's last name is a tribute to Mike (IX), who died of cancer in 1994. Gribble, along with Spike (III), founded the "Spike and Mike" Sick and Twisted Festival of Animation in San Diego. The Festival is considered the birthplace of Beavis and Butt-Head, since Spike and Mike produced Mike Judge's first two Beavis and Butt-head shorts.
The town of Arlen is in Heimlich County, Texas. Both are fictional.
According to the Season 1 DVD commentary, Bobby Hill's full name is Robert Jeffrey Hill.
In the episode "Death and Taxes", on the list of prison guards is the name Alex de Large - the central character in A Clockwork Orange (1971)
Stephen Root, who voices Bill, originally auditioned for the part of Dale.
In the episode where Bobby is afflicted with gout, he eats at a deli that has portraits of famous comedians on the wall. One portrait is Johnny Hardwick, the voice of Dale.
This show features the last television appearance of John Ritter, who reprised his role as Eugene Grandy (supplying the voice), the junior high school teacher during season 8. The episode was "Stressed for Success" which was broadcast on May 2, 2004.
Dale's middle name is Alvin.
Joseph Gribble is the name of a character in the Marx Brothers movie Room Service.
The last name of the character Bill Dauterive is an homage to the series writer Jim Dauterive.
Peggy's favorite song is Gloria Estefan's, "Can't Stay Away From You".
Mike Judge came up with the idea for this show in 1995.
Mike Judge and Greg Daniels pitched the show to Fox network executives, as an animated pencil sketch, featuring all the main characters with Hank doing the pitch.
In the episode about voting for the presidential candidate, Dale suggested to Hank that he was born in Ecuador; in real life, co-creator Mike Judge (voice of Hank Hill) was born in Ecuador.
There is no beer based on King of the Hill's "Alamo Beer". The Real Ale beer is actually called "Remember Alamo Golden Ale" but only in San Antonio, everywhere else it is called "Real Ale Firemans #4".
From the second season on, each episode ends with a line of dialogue from that episode being repeated.