In Astérix, two characters from Tintin appear as cameos - Those Two Guys who report on events, with one of them always mangling whatever the other says.
The Pirates are a Shout-Out to a comic that originally appeared in the same magazine as Asterix. That comic is now only remembered because of Asterix.
Asterix and Cleopatra is mostly based on the movie Cleopatra. The English translation adds in a bunch of references to Carry On Cleo - a parody film that used the same props, sets and costumes as Cleopatra but was far more recognisable and profitable in Britain than the original. For instance, Cleo's first line in the comic is "That's an infamous remark, O Caesar!" referencing Caesar's famous line from Carry On Cleo - "Infamy! Infamy! They've all got it in for me!"
In Mighty Avengers, Hank Pym has almost become a walking shout-out to the Doctor Who fandom. Multiple identities, personalities, and costumes over the years? Check. Female sidekick? Yep, Jocasta fits that right there. Heck he even has a do anything tool, i.e. Sonic Screwdriver, thanks to the use of a smart chip and Pym Particles to store multiple tools in one tiny thing. His base is even so similar to a TARDIS that Amadeus Cho calls him on it.
Avengers Assemble introduces the football-based British superheroine Magic Boots Mel, who is basically Jess Bharma with "Billy's Boots" from the Roy of the Rovers strip of the same name.
The Awesome Slapstick features several of these, to Marvel, DC, WB characters, and basically anything that the creators thought funny, especially in the second issue which took place in a mall.
The Joker's first appearance has civilians dismissing his threats over radio as a hoax, much like the 1938 The War of the Worlds broadcast, mentioning it in all but name.
The 1960's Batman series was generally held in disfavor by Batman's comic book creators, but prolific Batman writer Chuck Dixon was a fan of the show, and snuck in some tributes here and there. Most notably in a two-parter featuring pirate-themed villain Cap'n Fear, which was structured much like a two-parter for the show, and began "in the shadow of the Westward Bridge."
In Issue #25 Ted Kord flies the Beetle around Bludhaven with Oracle and recreates several of Nite Owl's scenes from Watchmen in the process. For bonus points Nite Owl was originally supposed to be Ted Kord.
In the Marvel comic Blaze of Glory: The Last Ride (essentially a "whatever happened to...?" focusing on Marvel's Wild West characters, specifically Two-Gun Kid, Rawhide Kid, Kid Colt, Outlaw Kid, Gunhawk, and others) a young boy excitedly rattling off the names of his dime-novel heroes mentions the name "Jeb Kent" - a character from the DC series The Kents (written by the same author).
Oh, and the large number of characters with "Kid" in their nickname is humorously Lampshaded within that issue; someone runs into the bar where they are drinking and calls out "Hey, Kid!" and they all turn and say, "Yeah?"
The Female's origin in The Boys involves falling into a big canister of synthesized Compund V. The name of the person in charge of the project? Doctor Uderzo.
In Captain America/Thor - The Mighty, Fighting Avengers, both Thor and Cap wind up in Camelot to discover Loki pretending to be Merlin. How does Loki explain away the change in appearance and demeanor to King Arthur?
Arthur: And you, Merlin... You seem now to have completely recovered from your... What did you call it...?
Made funnier by a comment in the new series that the 11th doctor hates wizards in stories because they always turn out to be him. (And indeed, the old series confirmed that he was indeed Merlin.)
Cartoon History of the Universe has the Gauls portrayed as Asterix and Obelix. Once they win a battle, they even mention how they're going to go to their own comic.
Dandridge: "Return of the Chap" has a pair of ghosts in a museum named after the hosts of a popular 2000 ADpodcast.
In Daredevil v3#10, Daredevil demands to know what The Moleman plans to do with a body he has stolen - asking if he has discovered a "Resurrection Bath" in his underground kingdom, a rather obvious nod to the Lazarus Pits of Batman fame.
The Hellfire Club segment of The Dark Phoenix Saga is a Whole Plot Reference to the The Avengers episode "A Touch of Brimstone". Because of this Jason Wyndgarde's name is a Shout-Out to Peter Wyndgarde (who played both the equivilent character in the original and Jason King) and Emma Frost's is a Shout-Out to Emma Peel. Later comics established the Black Queen of the London club as Emma Steed (a reference to Mrs Peel again and her partner John Steed) and a 17th century Black Queen was Diana Knight (Mrs Peel's maiden name was Knight and her actress was Diana Rigg) and her consort is Patrick Clemens (Patrick McNee played Steed and Brian Clemens wrote "A Touch of Brimstone".)
In the DC One Million 80-Page Giant, Rey Misterio can be seen leaping into a large crowd scene.
Issue #27 of Deadpool has a rather obvious one. "You smug little— Speaking of games. You ever play Street Fighter?◊" This would later be referenced in an actual Street Fighter comic, where Ryu says "Speaking of comics, you ever read Deadpool?" before hitting Sagat with the very Shoryuken that gave him the scar on his chest.
In Doctor Strange: The Oath, Strange travels to another dimension to face "Otkid the Omnipotent" and retrieve an elixir which he hopes can cure his servant Wong's inoperable cancer. The Corrupt Corporate Executive trying to destroy this medicine (he runs a pharmaceutical company) has a copy of The Fountainhead on his desk. Both are references to Doctor Strange's creator, Steve Ditko.
A shout-out to 4chan even made its way into one of the books.
In Final Crisis Aftermath: DANCE, the Super Young Team disbands halfway through the series and everyone goes their separate ways. True to his stated desire for "constant forward motion", Well-Spoken Sonic Lightning Flash decided to take a walk and simply kept going, eventually amassing followers who walk behind him. You know, like Forrest's cross-country run in Forrest Gump.
In Joss Whedon's Fray, a flashback page is shown while Earth-before-humans is described as a savage time filled with monsters and demons. The landscape shown is populated with the first few pages of the first edition D&D Monster Manual, including an Anhkheg, a Bullete, and so on.
In the third issue of the Great Ten miniseries, Thundermind (a bald telepath) knocks off the helmet of a God of War and reads his mind while he screams at him to "GET OUT OF MY HEAD!" Like so much X-Men...
Kyle Rayner once created Gurren with his Power Ring in Countdown To Final Crisis◊. He also created a Patlabor in Sinestro Corps War.
During Kyle's tenure on the Green Lantern series, a lot of his constructions were shout outs to Anime, video games, and cartoons. He enjoyed making Mecha and on at least one occasion he made a Chun LiExpy. Apparently Kyle Rayner is a Humongous Mechaotaku.
Allegedly in Green Lantern (Vol. 4) #25, the sound effect "EEEPAAAA" can be found. This is a shout out to The Simpsons Movie, in which Comic Book Guy says that "EEEPAAAAA" is a sound effect from a Green Lantern comic book.
The names of two GL Corps members, Arisia and Eddore, are also Lensman shout-outs — specifically, to the home worlds of that series' two Precursor races.
Judge Dredd often gives Judges the same surnames as various people who work on 2000 AD. It also references various other comics:
In the wake of the recent "mutant rights" storyline Dredd fought pro-mutant activist (but non-mutant) Dr Xerxes Clavier and his genetically-altered students, whose monstrous appearances reflect the original X-Men without actually giving them powers.
During the "America" story, a common graffito was "Who judges the Judges", done in a similar style to "Who Watches the Watchmen" in Watchmen.
Mega-City One's Blocks are named after famous people or fictional chaacters and are often ironic Shout Outs to something related to the storyline (a mob leader from Wat Tyler Block; mind parasites in Colin Wilson Block, etc). Dredd himself, with his similarities to Dirty Harry, lives in Rowdy Yates Block.
When the JSA All-Stars were looking for a team name, Judomaster suggested Kagaku Ninja Tai Gatchaman, to which one of her teammates even mention G-Force (Americanized version of the anime).
In the first storyline for JSA, the team goes up against Mordru and begin shifting into different realities. One of them is a anthropomorphic animal world home to the "Justice Critters". Starman in this world is a fox, making him "Star Fox".
In one issue, a parallel universe Joker was shown as very old and decrepit, sporting a smiley pin with a splatter of blood- just like the one in Watchmen.
In another issue of the same arc, there is a crowd of heroes in an outpost at the border of the universe which includes Owl Man.
Paul Cornell's Knight and Squire takes the cake — there are so many allusions in this comic that there is a text piece in the back to help non-Brits understand them! Notable ones include the Milkman who took down Two Ton Ted from Teddington, the Black and White Minstrels (named after an infamous program that included blackface all the way up to the 1970s), villainous counterparts to the Beatles (who even broke off and formed a villainous Wings), the Knight's AI on his motorcycle being named after Dan Dare's spaceship, and much, much more. And that's just in two issues!
Grant Morrison has said that Beryl "Squire" Hutchinson is named after D.C. Thomson character Beryl the Peril (originally from The Beezer, but currently in The Dandy). So naturally, Cornell gives her a spikey-haired boyfriend called Dennis Ennis.
In Legionnaires #59, a baseball player has the name Sisko on his shirt. And in #60 a group of people sitting in a Metropolis cafe discussing the storyline look a lot like alien versions of the Friends cast.
And what appears to be one to the Hulk in this Jonn is addicted to cookies, two of the other superheroes hid them in a prank. Hilarity Ensues. In addition, the phrase "Mars Needs Chocos!" sounds a lot a certain B-Movie title with a trope named after it.
Martians call their planet Ma'aleca'andra, a reference to Malacandra, the Martians' name for their planet in C. S. Lewis's The Space Trilogy. (Though J'onn's name for Earth is Perelandra, which was Venus in The Space Trilogy; Earth was Thulcandra.)
The name J'onn J'onzz could be an allusion to John Bigman Jones, a Martian who is one of the main characters in the Lucky Starr series (a human, although the first book does feature a race of somewhat similar Sufficiently Advanced Aliens who left he surface of Mars once it became uninhabitable)
In Mega Man, the third issue features a scene where Mega Man is overcome by his new responsibility to fight, becoming wrathful and a little bit deranged (for a ten-year-old, anyway). Dr. Light talks to him about why fighting puts his innocent heart into turmoil. The explanation the good doctor gives is practically a word-for-word transcription of the chorus of The Megas' song, "The Message From Dr. Light": "I made you in my image. I built your heart and gave you eyes. I gave you power and a sense of justice beyond any compare. I gave you hands, a child's face... heh... robot hair. But this burden, this burning in your heart, I did not put there."
In the 90's Morbius comic, a nurse asks "Who's Darkman?" when she see's Morbius covered by bandages when he was escorted to a hospital while trying to keep his identity a secret.
Mortadelo y Filemón: There are tons of shout-outs, tributes to and parodies of political figures, actors, and characters of comic-books and animation.
In a story, Mortadelo plants an electrified trap and he declares that it has power enough "to fry even Mazinger Z". Given that Spaniards Love Mazinger-Z, it is pretty normal finding a shout-out to that series.
In one Paperinik story, we are told that two aliens fought over Japan in feudal times, and were remembered as a heroic samurai fighting a demon. Together with other details, it becomes pretty clear that the creators like Tenchi Muyo!...
A mad scientist is bent on killing millions of people - including the entire population of Duckburg - for the betterment of mankind. Paperinik is determined to stop him before he has a chance to activate the process... but unfortunately he did that 35 hours ago.
In one issue of The Power of Shazam, Captain Marvel is shown strange alternate versions of himself that might exist if history changed. These include: Captain Thunder (DC's former Captain Ersatz Marvel), a Captain whose limbs and head detach from his body (M.F. Enterprises' Captain Marvel), a Billy Batson who transforms into Captain Marvel by striking a pair of wristbands together (Marvel Comics' Rick Jones and Captain Mar-Vell, and Hoppy the Marvel Bunny.
Preacher #21 opens by showing us the brutally murdered crew of the ship San Demetrio, followed by the ever-patient Saint of Killers. This is an obvious shout out to Dracula, wherein the title character sails to England on the Russian ship Demeter, after killing all the crewmen.
The Five Swell Guys in Promethea have very similar name to the Five Neat Guys, a parody vocal group on SCTV.
In one panel of The Sandman volume "Brief Lives", Delirium is either conjuring up or drawing on the wall a little beastie that looks an awful lot like Cerebus.
In "Doll's House," the nightmares Brute and Glob are hiding in the mind of a little boy named Jed. While inside his dreams, the art style, dialogue, and layout shift to resemble that of the classic Little Nemo pages, another comic about dreaming.
Klarion issue 2 has two major shoutouts: A group of teenage wannabe gangstas that befriend Witch Boy are clearly based on Archie and friends. The second is in a museum of superheroic vehicles- a flying saucer with eyeballs is clearly shown, a nod to Silver Age title Fatman the Human Flying Saucer.
Oh quite a few. Even British daytime television, for instance. Apparently, Richard and Judy were failed artificial life experiments by Decap Attack's Doctor Frank N. Stein.
There were plenty to all kinds of popular culture. Marvel Comics, for some reason, attracted several writers' ire with Take That parodies of their characters living on Planet Meridian in the Special Zone. More unusually, according to Word of God, is that Grimer was named for Grìma Wormtongue from The Lord of the Rings.
The Steed and Mrs Peel comic returned the homage by having two variant covers which showed Mrs Peel, in her Queen of Sin outfit, in the place of Emma Frost from the cover of an issue of New Mutants and Jean Grey from the cover of one of the Dark Phoenix issues of X-Men.
The Gronk in Strontium Dog is from the planet Glas in the Gallego system, a reference to Scifi author Blas Gallego.
Also, an episode where Superman finds himself in the middle of a battle between a titanic Metallo and a Super Robot. With all the myriad shout outs from other giant monsters that show up to complicate matters (including a rather literal Gorilla-Whale), you'd think the Robot would be based on Mazinger Z, and it is... due to the fact that it bears an even stronger resemblance to G. Kaiser.
Paul Cornell's "Black Ring" story arc in Action Comics gives Lex Luthor a sidekick who bears a striking resemblance to David Tennant. Lampshaded when the Joker claims (falsely) to have killed him: "He reminded me so much of that actor, I wanted to see if he'd turn into someone else!"
Uncanny X-Men #153 has two shout-outs to ElfQuest: Kitty Pryde wears an ElfQuest teeshirt, and in the made-up story she tells there's a sprite named Pini who calls humans "bigthings", like Preservers in ElfQuest.
Spanning rather more than one issue is the first name of Rahne Sinclair, who can shapechange into a wolf, apparently a shout out to Rahnee the She-Wolf, the second chief of the Wolfriders. (Rahnee was first mentioned in ElfQuest #4, published in 1979, Rahne's first published appearance was in 1982.)
A novel and live-action movie (early 1980's), 'Wolfen', has perhaps influenced Wolfsbane of the New Mutants. The emphasis on both the sensory details of her wolf-form, and the link with Native Americans.
In the Danish comic Valhalla, based on Norse mythology, Odin has in one story left Valhalla to win a bet with the Valkyries: that he can find the three greatest warriors of Midgard (he thinks they don't bring in any good Einherjar-material any more). His absence causes trouble in Asgard, so Thor, Baldur and Loki disguise themselves as three mortal warriors to trick Odin to come home again. They give their names as Fandral (Baldur), Hogun (Loki) and Volstagg (Thor), and are dressed as the three characters with those names from Marvel Comics' Thor (who aren't from original Norse myth but Lee/Kirby creations).
In softcover volume five of The Walking Dead, Philip says "Fifty-seven channels and nothing on..." while looking at a bunch of tanks with zombie heads in them. That's the name of a Bruce Springsteen song from the album Human Touch.
In the background of issues #11 and #12, you can see The Day the Earth Stood Still (1951) playing in a movie theater in the background. Ozymandias' plot to prevent nuclear war bears some similarities to the movie itself, where nuclear war is prevented by aliens coming to Earth, and telling the planet to put aside their differences, or be wiped out, essentially.
Includes explicit mention of an episode of the original Outer Limits with a similar basic plot.
Wylie's Gladiator is visible on Hollis Mason's bookshelf.
The entire "Tales of the Black Freighter" comic-within-a-comic is inspired by The Threepenny Opera and the song "Pirate Jenny" (a.k.a. "The Black Freighter") in particular.
Possibly a coincidence, but the Owlship looks uncannily similar to Seleno the Electric Dog, a primitive robot built during WWI as a testbed for a torpedo guidance system.
Hollis Mason's Nite Owl I costume◊ is very similar to The Phantom's◊ costume, and his dog is even named "Phantom".
For that matter, towards the end, it features a TV advertising the start of The Outer Limits episode "The Architects of Fear". The basic premise of the villain's plan is almost identical to that episode. Although Alan Moore claims it was a coincidence they were similar, he deliberately added the Shout Out upon discovering the similarity.
In the X-23 series Target X, Laura begins attending high school with her cousin Megan. Due to her, shall we say, abnormal upbringing, Laura thinks nothing of demonstrating her language skills to her French teacher by reciting a litany of ways to bribe and torture government officials, and later lists the exact amount of blood in the average human body and ways to kill someone in another class. The shout out comes from the depictions of the teachers: Jamie and Adam from MythBusters.
In one issue of Xombi, the characters are sitting around discussing a film they've just seen. Cast and plot details make it clear that the film they're discussing is the Film Within A Film from The Player.
Early in his career, Mark Millar did a stint writing Sonic the Comic. He credited this gig with helping to pay for his wedding, and thus there are references to Sonic in several of his works, including Secret History of the Authority and Wanted mini-series.
Abnett and Lanning again; now that they're basically in charge of Marvel's cosmic characters, they seem to love playing with the Alternate Company Equivalents they've acquired, whether it's teasing the idea of Ego the Living Planet joining the Nova Corps (in reference to Mogo, the living Green Lantern planet), or Rocket Raccoon using "Brainiac" as a sarcastic term of abuse (like "Einstein" or "Sherlock") to Mentor, the Imperial Guard's Brainiac 5 Expy.
And while the Imperial Guard's influence is obvious, there's also smaller references in them. The symbiotic duo Warstar, the Guard's Triplicate Girl/Duo Damsel counterpart, are named B'nee and C'cil after Cecil the Sea Serpent and Benny.
In 1998, Tom DeFalco penned "There Once Was a Spider..!" (Amazing Spider-Man #439), wherein a pair of archaeologists of a Future Imperfect find a webshooter and spend much of the issue explaining how their futuristic society thinks Spider-Man's life was like. Some of the many inaccuracies they believe in are that Spidey had a high-tech hideout with numerous trophies and spider-themed vehicles. Nearly 9 years later, a story of similar premise was used in Season 4, Episode 7 of The Batman called "Artifacts".
In Calvin and Hobbes, Hobbes once used Crisco to style Calvin's hair into Astro Boy's pointy-horn-hair. Hobbes points this out, which Calvin (and later Suzie) thinks is awesome.
In one Sunday strip, Calvin's parents admire a Krazy Kat comic strip in a museum. If they're not in museums, they should be.
The names Calvin and Hobbes are taken from a 16th-century theologian (John Calvin) and a 17th-century philosopher (Thomas Hobbes).
The Family Circus author Bil Keane did a few for Disney, where his son Glen works as an animator. Current Family Circus artist Jeff Keane did this Halloween 2012◊ shout-out, which is probably the first (not to mention oddly specific) mention of Warhammer 40,000 in newspaper comics.
Foxtrot had a moment coming at the end of a (week's worth) discussion by Roger and Andy about the success of the Dilbert comic (which might also count as an extended Shout Out]. In the end, they conclude that Dilbert is likely popular simply based on its own merits, meaning that emulation of a current success isn't a particularly good idea. Jason (drawn in a slightly different style) then runs in, telling his parents to check out the cool stuffed tiger he found.
Roger: Maybe we should include the recent past in that statement, too... Andy: I don't know. There's something to be said for nostalgia.
In the strip for November 9th 2013, Bucky is hit on the head by a tomato thrown at him from behind him. He says "It came from...behind", a reference to a line spoken by a Rebel pilot in A New Hope during the attack on the Death Star. The pilot said "They came from... behind" in reference to attacks by Darth Vader and his Imperial TIE fighter wingmen.
There's one in a strip during a 2004 story arc where Grimm goes to a veterinarian. While the vet was talking to Mother Goose, he briefly morphs into Garfield but still wears the doctor clothes, prompting Grimm to cry out, "NURSE!"
Grimmy: What are you watching?
Mother Goose: A history channel show about presidents.
Pooch Cafe. In the strip for September 11th, 2013 a cat is wrapped around a postman's face. Poncho says "Kitty drool. Great defense mechanism. You don't dare remove it or you get cat saliva all over yourself." This is a reference to the film Alien, in which Kane had an alien facehugger wrapped around his face. After Ash tried to cut it off with a laser, it dripped powerful acid and Parker said "It's got a wonderful defence mechanism. You don't dare kill it."
Superlópez: To the whole Super Hero genre, starting with the main character and working down. In early stories, when Francisco Pérez Navarro -a much bigger fan of Superhero comics than Jan- did the writing, these were much more frequent.
At some point, nearly every comic strip (and webcomic) has had a Shout-Out to Peanuts. Too many to list.