* 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". [[TomPetty Lucky's portrayer]] had a song called "Runnin' Down A Dream".
** Ben Stein voices [[Series/WinBenSteinsMoney a quiz bowl host]] in one episode.
* AuthorExistenceFailure: Averted twice.
** 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." Rather than drop the character, he was [[TheOtherDarrin recast]] by Jonathan Joss.
** Creator/BrittanyMurphy (the voice of Luanne Platter and the voice of Joseph Gribble before he hit puberty[[note]]which would be seasons one to four[[/note]]) was a cast member on the show and did die, but her death came three months after FOX aired the last episode ("To Sirloin with Love," not "Just Another Manic Kahn-Day"). Still, for any fan who wants ''King of the Hill'' to come back, it probably won't happen without Murphy.
* HeyItsThatVoice: [[HeyItsThatVoice/KingOfTheHill Has its own page, now!]]
* KeepCirculatingTheTapes: The [=DVD=]s only go up to Season 6, though the prospect of a [=DVD=] release is unnecessary as the series is easily and legally obtainable through the [=iTunes=] store. Netflix used to air 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.
** The [=DVDs=] will be coming out again now that Fox has licensed the DVD rights to Olive Films.
* 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 Heimlich County's 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 while 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 while 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 appearance (on the Season 1 episode "Order of the Straight Arrow"), he was played 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 (whom many ''Pete & Pete'' fans will recognize as the guy who played Artie, The Strongest Man in the World).
** 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 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 ReeseWitherspoon.
** Special circumstances[[note]]Brittany Murphy's movie career, which was expanding at the time of Season 4[[/note]] are behind this one, 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.
* ScrewedByTheNetwork: An odd case. ''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'').
* {{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").