Whenever a new character was introduced on the series, their initial appearance had them voiced by a celebrity guest star (ex. Rev. Stroupe was voiced by Mary Tyler Moore, and Roger 'Buddah' Sack was voiced by Chris Rock), but in all subsequent appearances, the character would be voiced by a series regular.
The voice of Boomhauer is based on a message left on Mike Judge's telephone answering machine by an irate viewer of Beavis and Butt-Head (1993). The viewer mistook the show's name as "Porky's Butthole".
Hank, Bobby, Peggy, Luanne, Bill, Dale, and Boomhauer were animated into an episode of The Simpsons (1989). 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.
This show 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.
How and when the show's last episodes would air became a point of uncertainty after FOX officially cancelled it early in 2009. The network originally planned to show unaired season thirteen episodes at some point in the early 2009 - 2010 season. It was later speculated that ABC would pick up the show for a fourteenth season, but the idea was shot down by ABC's President. FOX later said it would not air any of the season thirteen episodes, and fans believed they would premiere on either the cable Cartoon Network or a season thirteen DVD. In the end, two new episodes comprising a series finale aired on FOX on September 13, 2009.
The character of Hank Hill is based on a character in Beavis and Butt-Head (1993), 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."
Stephen Root was uncredited during the first few seasons. This was because he was also on NewsRadio (1995), 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 this show.
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.
In season nine, episode ten, "Arlen City Bomber", Lucky (Tom Petty) tells Bobby that he would help him "run down that dream" after Bobby lements that he would like to taste a corn chip right off of the line. This is a reference to Tom Petty and the Heartbreakers song, "Running Down a Dream".
This show features the last television appearance of John Ritter, who reprised his role as the voice of Eugene Grandy, the junior high school teacher during season eight. The episode was "King of the Hill: Stressed for Success (2004)," which was broadcast on May 2, 2004.
Producer John Altschuler created the character of Lucky Kleinschmidt. He described the him to Series Creator Mike Judge as a guy who "ought to look like Tom Petty without the success". This led producers to pursue Petty to provide the voice for the character, and to their surprise, he enthusiastically agreed.
Following the season two cliffhanger ending, rumors begin spreading through various FOX commercials and promotional spots that the Hills would be moving to Hollywood. TV Guide ads and the like even touted Propane Boom (the season two finale) as the "last episode in Texas!" This was all later, of course, revealed to be a hoax, meaning that show show itself (not the characters on the show) was moving to another night on the network, a move that nearly killed the series. Fortunately, this was later rectified, and the show eventually regained the coveted Sunday night prime time slot for the remainder of its run.
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 subdivision of Valley Ranch, just a few blocks down MacArthur Boulevard from the Dallas Cowboys' office and training facility (most of the streets in the neighborhood are also named after Dallas Cowboy greats). This is not a middle school, but an elementary school in Valley Ranch.
Throughout the series, on the rare occasion that Bobby is seen playing Little League, he wears #3. This is an homage to Babe Ruth, another husky baseball player. This connection is confirmed in "King of the Hill: Bad News Bill (2009)", when the coach refers to him as "Great Bobino", a nod to Ruth's nickname of "Great Bambino".
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, Texas. Everywhere else, it is called "Real Ale Firemans #4". Actually, as anyone who has ever been to Texas realizes, "Alamo Beer" is a parody of "Lone Star Beer", which has long semi-facetiously advertised itself as "The National Beer of Texas". This presentation is done along the same lines as "Luly's" for "Luby's", or "The Renaissance Faire" for "The Texas Renaissance Festival" and other satirical, yet apparent-to-locals, ways around potential copyright infringement. "Whataburger", on the other hand, is presented as-is, as are the "Dallas Cowboys".
Breckin Meyer and Brittany Murphy appeared in Clueless (1995), before voice acting on this show. Both of them voiced the same character, albeit at different stages of that character's life. Brittany Murphy voiced Joseph Gribble before he went through puberty, and Breckin Meyer voiced Joseph Gribble after he went through puberty. Murphy also voiced Hank's niece, Luanne Platter.
This show would go on to become Mike Judge's longest-running animated series, running for thirteen years, with Beavis and Butt-Head (1993) running for four years, then being revived in 2011, and The Goode Family (2009) lasting only one year.
Hank is seen as owning two pick-up trucks in the series. At the start of the series, he drives a 1997 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.)
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 Cash's song "Ring of Fire".
Bob's Burgers (2011), an animated sitcom that was also on the FOX network, features a variety of people that were also involved with King of the Hill: regular voice actors Pamela Adlon (credited as Pamela Segall and Pamela Segall Adlon at times) and David Herman; guest voice actors Gary Cole, Paul F. Tompkins, and Wyatt Cenac (who is also credited as a writer and producer); director Wesley Archer; and writer/producers Jim Dauterive, Kit Boss, and Mark McJimsey.
There have been many songs that have played over the course of the series. 1. 25 Or 6 To 4 2. Mickey 3. Hello Walls 4.Genie In A Bottle 5. Blue Moon Of Kentucky 6. Kids Of America 7. Insane In The Brain 8. Free Falling 9. I Will Survive 10. Dragula 11. Cherry Pie.