* ActorAllusion:
** In "Arlen City Bomber", Bobby says that his dream is to eat a corn chip right off the production line. Lucky tells him "I'm gonna help you run down that dream". [[Music/TomPetty Lucky's voice actor]] has a song called "Runnin' Down a Dream".
** Ben Stein voices [[Series/WinBenSteinsMoney a quiz bowl host]] in one episode.
* AuthorExistenceFailure: Averted. Creator/BrittanyMurphy, the voice actress of Luanne Platter and Joseph Gribble before he hit puberty,[[note]]From Seasons 1 to 4[[/note]] was a cast member on the show who did die. However, her death came three months after FOX aired the last episode.[[note]]"To Sirloin with Love," not "Just Another Manic Kahn-Day".[[/note]] Still, for any fan who wants ''King of the Hill'' to come back, it probably won't happen without Murphy.
* TheCharacterDiedWithHim: Averted. Victor Aaron, the original voice actor of John Redcorn, died in a road accident after recording his lines for his only episode "The Order of the Straight Arrow" (though he is still credited in "Luanne's Saga"). Rather than drop the character, he was [[TheOtherDarrin recast]] by Jonathan Joss.
* ExecutiveMeddling: FOX executives demanded the writers drop or at least scale back the recurring plotlines for syndication reasons, which accounts in part for the NegativeContinuity in later episodes. It's also claimed that in later seasons, network executives interfered to the extent that they were demanding rewrites while episodes were being animated.
* HeyItsThatVoice: [[HeyItsThatVoice/KingOfTheHill Has its own page, now!]]
* KeepCirculatingTheTapes: As of 2006, the [=DVD=]s only went up to Season 6, though many people felt the prospect of a [=DVD=] release was unnecessary as the series is easily and legally obtainable through the [=iTunes=] store. Netflix used to carry the entire series (including the four leftover episodes), and Creator/AdultSwim has been airing all of the episodes (including the missing four from FOX) since the show was in its final seasons. However, in 2014, Creator/OliveFilms picked up the rights to the [=DVD=] releases and began releasing the remaining seasons two at a time.
* LifeImitatesArt: One of the more startling examples, two years after "Orange You Sad I Did Say Banana?,"[[note]]The episode where Kahn feels like a sell-out after Ted Wassanassong calls him a "banana". It is a slur towards Asians who have lost touch of their heritage.[[/note]] in which Kahn joins a Laotian-American paramilitary group lead by a former general planning an attack on the communist government of Laos, a [[http://en.wikipedia.org/wiki/2007_Laotian_coup_d%27%C3%A9tat_conspiracy_allegation real life Laotian American group]] lead by a former general planned an attack on the communist government of Laos.
* MissingEpisode: Because FOX wanted to get rid of the show as quickly as possible (as they needed room for ''WesternAnimation/TheClevelandShow''), the network decided to pick two episodes out of the last six they ordered and unaired the remaining four. The last two episodes that aired were: "The Boy Can't Help It",[[note]]Where Bobby is taken advantage of by three high school girls.[[/note]] and "To Sirloin with Love".[[note]]Where Hank discovers Bobby's talent for identifying flaws in beef cuts and puts him on the Heimlich County Community College meat inspection team.[[/note]] The four episodes that didn't air on FOX aired in network syndication, on [adult swim], and were on Netflix. Those episodes are: "The Honeymooners",[[note]]Hank's mom breaks up with her longtime boyfriend and dates a man she barely knows.[[/note]], "Bill Gathers Moss",[[note]]Bill rents his house out to roommates on Craigslist.[[/note]] "When Joseph Met Lori and Made Out With Her in the Janitor's Closet",[[note]]Dale commits himself to a mental hospital to get out of talking to his son about sex; meanwhile, Nancy searches for the best human interest story.[[/note]] and "Just Another Manic Kahn-Day".[[note]]Hank recruits Kahn to build a grill by forcing him not to take his medication, which he needs for his bipolar disorder; meanwhile, Bobby tries to find the humor in an old comedy record Peggy likes.[[/note]]
* NamesTheSame: Before Donna from accounting was introduced, there was an overweight background character with the same name, who was fired for stealing office supplies.
* TheOtherDarrin:
** In John Redcorn's first speaking role, in the Season 1 episode "Order of the Straight Arrow", he was voiced by Victor Aaron. When Aaron died in a car accident, Jonathan Joss was hired to take over as the voice actor of John Redcorn for the rest of the series.
** M.F. Thatherton was voiced by Burt Reynolds in his first appearance. In all other appearances, he was voiced by Toby Huss.[[note]]Whom many ''Pete & Pete'' fans will recognize as the guy who played Artie, The Strongest Man in the World.[[/note]]
** Hank's mom, Tilly Hill, was voiced by three actresses: first by country singer Tammy Wynette for two episodes in Season 2. When Wynette died, she was replaced by Beth Grant during Season 3 (plus the unaired episode "The Honeymooners"). Finally, K. Callan voiced Tilly in two Season 5 episodes and one Season 8 episode.
** Roger "Booda" Sack was voiced by Chris Rock in his first appearance, and was voiced by Creator/PhilLaMarr doing a Chris Rock impression (the same one he did on a couple of episodes of ''[=MADtv=]'') in subsequent appearances.
** Debbie Grund was voiced by an unknown actress during her one talking scene in Season 3 (possibly Ashley Gardner). In her only other speaking appearance (the two-parter where she vows to kill Buck Strickland after he broke up with her and ends up dead in a Dumpster), she was voiced by Creator/ReeseWitherspoon.
** Special circumstances are behind this one,[[note]]Brittany Murphy's movie career, which was expanding at the time of Season 4.[[/note]] but it's worth noting that for the first four seasons (and a few episodes in Season 5), Joseph Gribble was voiced by Brittany Murphy. When Joseph hit puberty on the episode "I Don't Want to Wait for Our Lives to be Over," he was voiced by Breckin Meyer.
* PlayingAgainstType:
** Janeane Garofolo provided the voice of a sexy exterminator who tries to act as a RomanticFalseLead to Dale. He doesn't bite.
** Creator/DannyTrejo as Enrique in the later seasons, with him playing the role of a relatively normal guy for once.
** In Johnny Knoxville's first role in the series, he provided the voice of a cool but responsible small business owner who mentors Bobby in "Business is Picking Up." Later, he returned to provide the voice of Luanne's dad.
* PostScriptSeason: Seasons 12 and 13. The Season 11 finale is explicitly designed as a ''series'' finale, with the Lucky-Luanne wedding, cameo appearances by everyone from Cotton and John Redcorn to Hank's half-brother Junichiro and Chuck Mangione, and the ending with Hank and the gang drinking beer in the alley. Then Fox decided to renew the show for two more years. YMMV whether or not this benefited the show. Some people think the show should have ended after Luanne's wedding, while others think "To Sirloin with Love" was a better ending, as most of the series centered on Hank and Bobby trying to be father and son and "To Sirloin with Love" showed that Bobby does have a hobby that doesn't bore him or disappoint/embarrass Hank.
* ScrewedByTheNetwork: ''King of the Hill'' was a huge hit in its first few seasons, but Fox damaged the show's ratings by constantly shuffling its time slot. Even during its last few seasons, when it returned to its original 8:30 Sunday slot, ''King of the Hill'' was pointedly treated as the lesser show of Fox's "Animation Domination" block due to the continued popularity of ''The Simpsons'' and FOX banking everything on Creator/SethMacFarlane's shows (''WesternAnimation/FamilyGuy'', ''WesternAnimation/AmericanDad'', and ''The Cleveland Show'').
* TooSoon: "Revenge of the Lutefisk" premiered the ''same day'' as the Columbine High School shooting. It was not broadcast in the Denver area or rerun there for quite some time. Many other Season 3 episodes which dealt with death, grief, or suicide including "Propane Boom"/"Death of a Propane Salesman"[[note]]the arc about the Mega Lo Mart explosion and [[spoiler:Buckley's death]][[/note]], "Pretty Pretty Dresses" [[note]] about Bill's suicidal depression[[/note]], and "Dog Dale Afternoon" [[note]]which contains a scene where Dale [[ItMakesSenseInContext is mistaken for a sniper in a tower and is almost killed]][[/note]] were not rerun there for a long time. Two of the four remaining episodes of that season, specifically "Death and Texas" [[note]]Peggy visits a death row inmate[[/note]] and "Wings of the Dope"[[note]]the Buckley's Angel episode[[/note]], were almost not shown at all there but were ultimately permitted to air, and at least [[http://www.goodreads.com/quotes/1330542-i-don-t-get-as-much-fan-mail-as-an-actor one of them proved helpful]] to a young woman who had lost a friend in the shooting.
** A throwaway line in "Joust Like a Woman" in which a teen boy calls the make-believe king at a Renaissance Faire "gay" was edited out of airings on AdultSwim following several high-profile suicides of teens who had been bullied for being gay in late 2010. The scene was reinstated on Adult Swim two years later.
** Some network television stations which air King of the Hill in syndication pulled "The Peggy Horror Picture Show" from rotation following the suicide of Leelah Alcorn, as the episode contains outdated, confusing, and incorrect information about the transgender community[[note]]for example, it calls a closeted transgender woman a "drag queen," when a drag queen is someone who only does it for performance; Carolyn lived her public life as a woman and preferred female pronouns.[[/note]].
* {{Tuckerization}}: Bill Dauterive is named after script writer Jim Dauterive.
* VindicatedByCable: FX, during the show's original run, and Creator/CartoonNetwork's [adult swim] have arguably treated ''King of the Hill'' much better than Fox ever did (in terms of putting it in a consistent timeslot where people would actually be able to watch the show), with the show finding new fans through syndication years after it ended. When [adult swim] briefly removed ''King of the Hill'' from its lineup in fall of 2013, they encountered enough viewer backlash to not only bring it back, but place it in a more prominent timeslot. As of 2014, it's now the first cartoon that airs when Cartoon Network stops broadcasting for the day and [adult swim] starts (8:00pm Eastern Standard Time).
* WhatCouldHaveBeen:
** The Spanish SoapOpera, ''Monsignor Martinez'', was actually planned to be a live action spin-off, but it got killed mid-production when the crew couldn't find a network that would accept a show about a Catholic priest assassin.
** According to the DVD commentary for the pilot episode, the show had a lot of titles before ''King of the Hill'' was chosen. Some examples include ''Dale Gribble and the Other Guy'', ''I'm Gonna Kick Your Ass!'', ''Citizen Hank'', ''Propane Man'', ''The Hank Hill Family Hour'', and ''Hank Hill and His Clan''.
** The first episode was originally going to be "Westie Side Story" (the one where Kahn and his family move into the neighborhood). However, for reasons unknown, it was replaced with the episode where a social worker accuses Hank of beating Bobby.
* WriteWhoYouKnow: Mike Judge based Boomhauer's voice on a MotorMouth phone call he received complaining about ''Beavis and Butt-head'' (which the caller referred to as "Porky's Bunghole").