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).
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".
Hank, Bobby, Peggy and Luanne 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, who died of cancer in 1994. Gribble, along with Spike, 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.
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.
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".
King of the Hill was passed over for renewal in September 2005, which would have made season ten its final season. The order for new episodes was only made after production had ended on the show. The renewal for the eleventh season was due to the high ratings of season ten.
In the episode with the diving pig at the fair, the pig's most difficult dive is called the "Johnny Cash", and it must dive through a flaming ring. This is a direct reference to Johnny's song "Ring Of Fire".
When Cotton flees to Las Vegas, all of the hotel/casino names are fictional, but are parodies or real ones. For instance, the Golddust is a parody of an actual hotel/casino called the Stardust.
In addition to providing the voice of Luann, Brittany Murphy voiced the young Joseph Gribble. When Joseph hit puberty, Breckin Meyer took over the role.
How and when the show's last episodes would air became a point of uncertainty after Fox officially canceled it early in 2009. The network originally planned to show unaired Season 13 episodes at some point in the early 2009-10 season. It was later speculated that ABC would pick up the show for a 14th season but the idea was shot down by ABC's president. Fox later said it would not air any of the S13 episodes and fans believed they would premiere on either the cable Cartoon Network or a season DVD. In the end, two new episodes comprising a series finale aired on Fox on September 13, 2009.
Hank is seen as owning two pickup trucks in the series. At the start of the series, he drives a 97 Ford Ranger. Later in the series, when he is forced to replace his truck due to it being hit by a train, he upgrades to a Ford F-250. (The model year is unknown, but, the body style was in production from 1999-2006.)
Boomhauer's job is not stated for most of the series. Near the end of the final episode a shot shows a badge in his wallet identifying him as a Texas Ranger.
In nearly every episode of the show, Hank, Dale, Bill and Boomhauer stand in the alley and drink beer. Creator Mike Judge has described the four of them as like "the Greek chorus of the show".
Would go on to become Mike Judge's longest running animated series, running for 13 years with Beavis and Butt-Head running for 4 years then being revived in 2011 and The Goode Family lasting only one year.