Any work where the Homages and Shout Outs are almost too numerous to count. Often these are fan works or comedies (goes triple if the series is a Long Runner), since it would be distracting to have so many of these in more serious works, save for comic relief moments.
But even in the appropriate works, how well this is done depends on most of the references being done well. Sometimes this works, sometimes not.
The references can even turn into multiple Genius Bonuses.
Compare Trope Overdosed, Refuge in Cool, Pastiche, Fountain of Memes, Continuity Cavalcade.
Examples:
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Anime & Manga
Pani Poni Dash! literally has well over 500 over the course of a 26 episode series and 1 OVA.
While it's always been a tradition for some Humongous Mecha designs in Gundam shows to riff on ones from previous series, Gundam SEED Destiny cranks it to the max. The best example is probably the colossal Destroyer Gundam, a Psycho Gundam knockoff that turns into a Big Zam.
The anime for Asobi Ni Iku Yo, known as Cat Planet Cuties in the US.
Comic Books
Watchmen has a whole load, especially musical references, but also to works of literature, and modern pop-culture.
Astérix as well, but like in the Looney Tunes example, some are too old to be recognized, even by the French audience.
The League of Extraordinary Gentlemen. Specially in the latest graphic novels. Seriously, you will be surprised how many British 60's sitcom characters can appear in a number of pages.
The Sandman is an unusual serious example; it probably manages to stay serious because its Homages and Shout Outs are usually to myths or the classics instead of pop culture.
Kill Shakespeare has a lot of references to Shakespeare, naturally.
As you can see in the picture above, the Monica's Gang comic can get so blatant and ridiculous in it's shout outs, it can be called Refuge in Audacity (and that Avatar parody manages to put more blue characters - which include a real person, Zidane... - in another panel◊). This also applies to other brazillian comics, such as Holy Avenger.
A Running Gag on a satirical Tumblr about Monica's Gang is saying "Mauricio's lawyers, get ready..." every time the comic uses No Celebrities Were Harmed. (the caption of the page image was "that panel alone is probably worth two billion in lawsuits, dammit!")
"Bloom County was awash with pop culture references and celebrity mockery...largely because those beguiling assets were virtually absent from the comedic media at the time. But just look at us now. No, it's not my &@%# fault.
Fan Fiction
This can actually be quite a problem in fanworks, especially since (a) the authors are generally pretty geeky by default, (b) there's often an unusually large amount of interaction between writer and audience, and (c) they're derived from pre-established settings anyway. Eventually, the sheer quantity of Shout Outs to other shows can reach critical mass, causing a hitherto coherent story to collapse into a formless heap of references.
A conservative estimate of Battle Royale fanfiction Seventy Two Hours' reference count would be 500. This is not an exaggeration, considering that each of the eponymous hours has its own chapter, and it's roughly equivalent to a 1300 page book in length. It is, however, testament to the obsession with shoutouts held by the author.
Or the "_____ Movie" parody series in general (Epic Movie, Date Movie, Scary Movie...), in that they are nothing "but" pop culture references and shout outs, without the film makers remembering for a parody the reference has to be the start of the joke, not the end of it.
Ready Player One has this as part of its plot, but narrows it to 1980s video games and pop culture in an effort to solve the puzzle left behind by a rich eccentric as part of his will.
Finnegans Wake features thousands of references to everything imaginable.
A Night In The Lonesome October abounds with references, being a wide-ranging gothic horror pastiche with references to other genres. It contains many Homages and Shout Outs beyond its crossover characters.
The works of Philip José Farmer are sometimes Reference Overdosed, particularly those set in the Wold Newton universe. A single work may be a Homage to one writer while encoding allusions to the work of many, many others. For example, no name is innocent until all anagrams, obscure linguistic derivations and so forth have been exhausted.
The Ciaphas Cain books are absolutely loaded with references to both science fiction and turn-of-the-century juvenile adventures.
The author of the Warhammer novels collectively known as "The Vampire Wars" acknowledges his books contain at least a hundred references to classic vampire stories like Dracula. One of his fans sent him a list of references in his novels, but the author didn't have the heart to say he'd missed about another fifty.
The first page of Where's Waldo? The Wonder Book. It puts all the other examples to shame.
Bret Easton Ellis likes to do this with his characters to highlight how shallow they are. Many pages in Glamorama are just long lists of Victor and his friends name dropping celebrities, and in American Psycho, Patrick has to describe in excruciating detail what everyone is wearing.
T. S. Eliot's works, especially The Waste Land. The poem is full of classical literature and religious references, and quotes them in their native language.
Spaced. There's even a bonus subtitle track on the DVD that notes all the references.
Community. Abed is stated to be incapable of communicating through any other medium than movies.
Psych CONSTANTLY references obscure 80s and 90s pop culture.
NCIS: Tony is a movie buff, and McGee is a gamer, among other justifications for this.
Gilmore Girls is famous for its abundance of references. Each DVD even has a little booklet explaining the more obscure ones.
Monty Python's Flying Circus: many encyclopedic references to historical and cultural figures, exotic animals and places. Most of these jokes could make sense to intellectuals, but then there are also many references to British culture, especially politicians, TV hosts and programs that were famous during the late 1960s and early 1970s. They are usually completely incomprehensible and obscure to international audiences and even to the English, especially while Time Marches On.
Doctor Who. Good Lord. Its almost fifty years old, so its accumulated a lot over that time. Some of the older episodes reference things like Beatles lyrics, while New-Who has referenced things like Star Trek, Ghostbusters, Harry Potter, Teletubbies, and way, way more.
Red Dwarf often makes reference to films such as Casablanca, Gone with the Wind, and Blade Runner. For instance, the episode Back To Earth is considered by most to only be enjoyable if you know the Blade Runner references, to most other fans it is a horrible episode.
Also, Ghostface Killah had a song from the 1996 album Iron Man (which was when he started using the alias Tony Stark) entitled "Daytona 500" (named mostly for its fast pace) which used clips from the original Speed Racer to make one of the first Anime Music Videos which is still considered a favorite by many.
The song itself contained samples from Bob James' "Nautilus" and "Crab Apple" by Idris Muhammad whle the chorus from "Turn The Beat Around" by Vicki Sue Robinson sped up and reworded for the hook. And even featured two samples from previous Wu singles, "Mystery of Chessboxin" and Raekwon's "Incarcerated Scarfaces" which also had an obvious Shout Out in title as well as the lyrics.
The mileage varies, but this opened the AMV flood gates, being one of the first AMV's showed on TV and predating YouTube and self-made AMV's.
Half Man Half Biscuit. Their website has a section dedicated to explaining some of the references.
No More Kings. When describing them most places refer to them and funk/pop mixed with 80s references. Though there are more references, the 80s are just the most prominent.
Frank Zappa: his music was deeply personal and references several aspects of the society of his time, including music, commercials, politics, TV and even inside jokes in his own band and anecdotes from his own life. Zappa once claimed that he doubted if his lyrics could make sense to anyone but himself.
Sage Francis, a rapper from Providence, RI, makes tons of references to "classic" hip hop songs. He'll often re-use classic lines, substituting a word here or there or reversing the word order as a kind of wordplay homage; he'll also re-use the cadence of certain iconic lines in a subtle nod.
R.E.M.'s music would frequently make references to ancient mythology in order to conceal the true meanings of the songs (namely Michael Stipe's bisexuality or political events). This had the side effect of making people think he spoke gibberish. To clarify, the first time he admitted to writing a song with straightforward lyrics was in 1992 when the band recorded "Everybody Hurts" - 12 years after they started.
Dungeons The Dragoning, which mashes together the rules of several pen-and-paper systems, uses the setting of others, and gives shout-outs to everything else.
NetHack is quite possibly the most reference overdosed game to ever be created. It boasts hundreds of literary quotes regarding topics as mundane as doorways and a wide reference pool that encompasses a large variety of topics: ancient mythology, fantasy, geek culture, mathematics, physics and other games.
The Ace Attorney series is filled to the brim with Shout Outs, ranging from television to internet memes.
World of Warcraft originally used to have a handful of Shout Outs in the form of traditional Easter Eggs, but since Burning Crusade, almost every character, quest name, and area is a reference to something, probably blatantly.
The web-based MMORPG Kingdom Of Loathing is simply brimming with references to other works, particularly They Might Be Giants songs and music in general. This is one of its main draws.
Touhou. Even the attack names can be references to Japanese mythology, and obscure ones at that. One game had a plot that referenced three separate Japanese myths...and UFOs. It also had references to older games in the series and Space Invaders.
The Uminekono Naku Koroni visual novels are packed to the brim with references- from mystery novels and scientific concepts, to Shout Outs to various anime and video games.
The Legend Of Zelda Skyward Sword does this to the Logical Extreme: as a Prequel, almost everything is a direct reference to some other game in the series. You really do have to be a Zelda fan to fully appreciate the game.
Abobo's Big Adventure is so jam-packed with references to the NES games, and to various aspects of '80s pop culture, it is impossible to list them all.
Aqua Rhapsody, The developer notes that a lot of small things are "shoutouts" to video game, anime, etc. These are as obscure as the level transitions that fade out in a similar manner to Space Harrier.
Cat And Girl - and many of the references are to philosophical notions unknown to the average reader, in a particular appeal to the Sesquipedalian Loquaciousness crowd.
This phenomenon was a constant in the Global Guardians PBEM Universe, and given that the players involved included ordained ministers, a professor of quantum physics, a member of the British House of Commons, several professional writers, a television producer, a movie special effects expert, a chef, three lawyers, active duty soldiers, artists, actors, attorneys, doctors, nurses, police officers, fire fighters, a librarian, a stock broker, computer programmers of various types, a Roman Catholic priest, a biochemist, the mayor of a small Florida, and a professional dominatrix, amongst others, all of whom were highly educated and all of whom were widely read, this was to be expected. Some stories were so thick with various references (from pop-culture to legal to scientific to political) that the story itself was lost in the mix.
Everything about it, since it's a superhero universe which has Marvel and DC as superhero comic publishers within it. People constantly refer to this, talking about a girl who leaps in front of teammates to protect them as having 'superman syndrome' or arguing about what is needed for Marvel to make an Iron Man movie or even talking about why 'real' supers can't swipe copyrighted/trademarked superhero names.
YouTube Poop is chock full of random references to pop culture.
A Very Potter Musical. Of course there's references to the books, but between that you've got things like Zac Efron. Furthermore, entire parts of the dialog are just homages to Avatar: The Last Airbender.
Survival of the Fittest: Due to being a collaborative work between the board's members, it qualifies. While there have been Shout Outs to previous versions and the original canon, a few others are to... less expected works, such as a character suddenly talking like Kefka, and a few characters being an Expy of characters from other works. Honestly, if one were to list every single reference in SOTF, it would take a while. It has been a minor issue on the board, however, in how many Shout Outs are okay.
Family Guy, although it has gotten out of hand for a lot of fans, and nowadays the show frequently includes references that are nothing but padding, without a joke to justify their inclusion.
Many Looney Tunes and Tex Avery cartoons, but as Time Marches On fewer and fewer people get the references. This is especially caused by references to film actors, radio shows, songs, and commercials that were very popular in the United States during the 1930s, 1940s, and 1950s, but are nowadays completely obscure for modern audiences. Examples are:
"Turn off that light!" (reference to air raid wardens during World War II)
"It's a possibility!" (reference to Artie Auerbach's catchphrase as Mr. Kitzle during Al Pearce's radio shows)
"I love that man!"
"Don't you believe it!"
"Aha! Something new has been added!" (reference to Lucky Strike cigarettes)
"B.OOOOOOOOOOOOOO!" (reference to a commercial for spray against B.O. (body odor))
Transformers Animated. Without interfering with the plot or making it so that you can't follow it if you don't know what's being referenced, it manages to fit in a zillion little easter eggs into every episode. Its "Allspark Almanac" guidebook is this taken to its logical extreme. Every single thing references something, no matter how deeply the reference is buried *
Some of the symbols on some pages are actually from the Cybertronian language as seen waaay back in Beast Wars, and are references to movies, songs, etc. Ironically, the references written in Cybertronix primarily reference everything but TF itself.
or how obscure the things being referenced are *
For example, a minor character from a Japanese radio program, the letters page of a comic book from 20 years ago, or a not-official TF comic serial printed in a magazine might be name-dropped, and items whose composition isn't mentioned in-show will be given as materials that one side or the other tried to obtain in a G1 episode or comic. Basically, if it's a number or a proper name, it references something. No exceptions. Period.
Oh, and a second volume is on the way.
The short-lived Spaceballs series was nothing but Whole Plot References. No original storylines or jokes to be found anywhere. Probably explains why it was short-lived. Yes, the whole concept is a Whole Plot Reference to Star Wars, but you'd think the writers could come up with at least a few new plots and gags in the 15+ years it took to get the cartoon made.
South Park series have tons of these in almost every episode.
The Imaginationland episodes of South Park, which feature virtually HUNDREDS of fictional characters.
The Venture Brothers. The show references music, history, art, literature, politics, pop culture (from the 1890s through modern), comic books, pulp fiction, film, television, philosophy, religions, etc. Each episode is approximately 22 minutes long and every single one includes dozens of these.
Aladdin, the film with Robin Williams makes this especially the case. Many of his scenes and lines were done on the fly, and when he's in full flow it becomes a 'how many references can you spot' game.
