Rusty Venture had his own cartoon in The Venture Bros.. As a result, many people finish his own anecdotes for him - and he's left wondering what were his actual experiences and what were just cartoon episodes.
The Binky the Clown Show in Garfield and Friends: Binky was a relatively minor character and Garfield would occasionally end up on the set of the show. Binky would occasionally show up to torment Garfield ("HEEEEEEEY CAT!"), as well as the show coming up in Garfield's channel surfing. There was also the "Screaming With Binky" quickie segments which Garfield narrated or hosted.
Jay: And if you ever want to visit my show — Bart: Nah, we're not going to be doing that.
Nearly every on-air personality of KBBL has also been portrayed as an ordinary citizen of Springfield.
Total Drama Island takes this to Mind Screw levels. Even now fans are utterly confused as to what's part of the show and what's part of the Show Within A Show. Made even more confusing by the fact that the Show Within A Show shares the exact same name as the show itself.
A simpler example would be the gossip network, Celebrity Manhunt which dishes out information about the contestants of Total Drama and Total Drama Aftermath which was hosted by Geoff and Bridgette during Action.
Celebrity Deathmatch pretty much is this Trope. (And for some strange reason, the violent Deadly Game broadcast by Nick and Johnny is considered a "family show" in whatever reality it takes place it.)
The Itchy & Scratchy Show, which is a segment of the Krusty the Klown show, making it a show within a show within a show (And at a time, a show within a show within a show within a Tracey Ullman show...) Further yet, a Type One within a Type Two. Also a regular Type I for the episode in which Homer voices Poochie, a temporary costar to Itchy and Scratchy.
Besides the trope-namingnews reports, The Simpsons has several other recurring fictional shows, including The Happy Little Elves, Eye On Springfield, I Can't Believe They Invented It!, and Smartline. There was also a slapstick sketch show of some sort starring Mexican comedian Bumblebee Man.
The Arnold Schwarzenegger-like film star Rainier Wolfcastle plays the character McBain in a few films within the show's universe, along with several other action/adventure films and once played the role of in-universe comic book character Radioactive Man. (Not all his projects are successes however. His attempts at comedy were viewed as someone what lame, and he hosted a rather politically incorrect show called Up Late with McBain that even Bart thought was horrible.)
There were also several shorts that stared has-been B-movie actor Troy McClure. (When voice actor Phil Hartman was murdered by his wife, Troy was Put on a Bus permanently, along with Lionel Hutz, the other character voiced by Hartman. Matt Groening later told Empire magazine that Hartman had been interested in starring in a live action movie about Troy McClure, but while the idea "never got further than enthusiasm" that "it would have been really fun."
All My Circuits within Futurama. This becomes something of the reverse of the above case when show star Calculon intermittently becomes involved in the main protagonists' lives. Futurama also had the Twilight-Zone-style The Scary Door, and Everybody Loves Hypnotoad, a full episode of which was included as a DVD featALL GLORY TO THE HYPNOTOAD.
Puppet Pals within Dexter's Laboratory and The Justice Friends. It also turned up on The Powerpuff Girls. The Justice Friends also count as Type 1, as had their own segment on Dexter's Laboratory, and in a couple of cases made appearances in Dexter's stories. A few of them also guest starred on one episode of The Powerpuff Girls.
The recurring radio show Danger Woman in TaleSpin.
Adventures of Bionic Bunny and Mary Moo Cow in the Arthur cartoon.
Though we never actually see the show in question, The Mighty Ducks: The Animated Series had a recurring gag involving the fictional Bernie the Bear, and arguments as to whether a character who drove a car and wore a watch could be considered a bear. Arguments being made by a pair of anthropomorphic ducks.
Hello, Megan from Young Justice is Miss Martian's favorite show. It wasn't popular in-universe, however, and only lasted one season.
"Agony County", a One Tree Hill-style teen soap referenced on Kim Possible falls in both categories 2 and 4; Kim and Ron are both fans of the show, and the teasing of the lead couple was paralleled by Kim and Ron(the original Grand Finale, "So the Drama", ended with Kim and Ron becoming a couple):
Ron: Oh please, are they still teasing that Charity and Danny will get together? Kim: Like that's ever going to happen. Besides, it would end the series.
Super Robot Monkey Team Hyperforce Go! has an interesting example with the Sun Riders, Chiro having been a fan of their show at one point (and who's to say he still isn't?). The show doesn't become relevant to the series, but the characters sure do!
In "The Gray Ghost", the villain's MO is patterned after that of a villain in the show The Gray Ghost; Bats also ends up teaming up with the show's hero, who's played by Adam West of all people.
In "Baby Doll", there is a rash of kidnappings, and all the victims are the stars of a particular old sitcom — Bats and Robin end up watching parts of and researching the show for clues as to who would have held a grudge against them.
Hard Times for Haggis from The Ren & Stimpy Show is a truly mind-bending example. The protagonist is the stereotypically Scottish Haggis McHaggis, whose variety-one show-within-a-show "The Scotsman" is cancelled and replaced by... the "The Ren and Stimpy Show". Irate, Haggis gets revenge on Ren and Stimpy by hijacking their show with a crude sock-puppet simulacrum performed by his hired thugs. Haggis' plan backfires when the sock-puppets become an instant smash-hit and him, Ren and Stimpy being thrown out on the street. Also, Stimpy's favorite show, the Muddy Mudskipper Show, fits into this trope.
The Red Badger of Courage and Flash the Wonder Dog in Chip 'n Dale Rescue Rangers, both of which Dale is a fan of. Each of these shows only appears in one episode, but the Rangers manage to save the latter and clear the main actor from false criminal evidence.
The Replacements features The Majestic Horse, Monkey Cop, Rainbow Jumper, and Splatter Train, among others. The Majestic Horse could be seen as an example of Type 4 in the first episode in which it appears (although it's more that the events after the movie is shown parody the movie or subvert its premise), and at least one episode involves the Darings in the production of a movie.
In The Venture Bros. episode O.R.B. featured the Rusty Venture Show DVDs in which a critical clue to the orb mystery was hidden in a single frame of a sniper rifle shot. It was a URL for a google map of the Venture compound.
In "And the Mole Rat Will Be CGI", a producer plans to make a movie about Team Possible, which results in a confrontation with the Seniors when Seņor Senior Junior tries to force his way into the starring role.
In the Dennis the Menace (UK) TV series, the episode "The Day TV Was Banned" involves Dennis attempting to watch his favourite TV show, Nick Kelly. What's also notable about this is that Nick Kelly was a character from The Topper, a comic from the publishers [DC Thomson] who also publish The Beano, in which Dennis the Menace UK appears. This makes Nick Kelly one of the few DC Thomson strips to have an Animated Adaptation, alongside Bananaman, Marvo the Wonder Chicken (from The Dandy) and the aforementioned Dennis the Menace UK.
In The Little Rascals second-season episode "The Zero Hero", Darla is selected for a date with her favorite TV superhero, Captain Muscles (apparently a spoof of George Reeves' portrayal of Superman).
Weird World in The Secret Saturdays is, arguably, a mix of all four types. 1.) The Big Bad, Argost, is the host of Weird World; 2.) Zak, the Kid Hero, is a huge fan of the show, with 3.) Zak's knowledge of Argost's house coming from the show and helping the family survive their rescue mission inside, and 4.) both shows heavily feature cryptids and follow their respective main characters' search for the Kur Stone.
The Powerpuff Girls had the season five episode "Neighbor Hood," which had Bubbles as a loyal viewer of a children's TV show that enticed kids to send "magic paper" from their parents' wallets to the show to keep it alive (a reference to a stunt Soupy Sales pulled on his show in the 1960s). This was intened to be a season one episode, but the staff was afraid of a lawsuit from Fred Rogers (Mister Rogers' Neighborhood) so the storyline was given to DC Comics to make as the story "Remote Controlled" (issue #7).
In South Park, the Terrance and Phillip show revolves around vulgar potty humor — something for which South Park's detractors often fault it.
Young Justice has "Hello Megan", an 80's sitcom that Miss Martian took her human name and physical appearance from. It's revealed that she suggested Superboy's civilian identity of "Conner Kent" because Megan's love interest on the show was named Conner. Superboy is understandably weirded out when he learns this.
The first season had Space Heroes, which parodies Star Trek: The Animated Series. Other than the homages to the Star Trek characters, characters such as Captain Ryan represent Leo and the gang.
The second season has Super Robo Mecha Force Five!, which is another parody, this time of Voltron. This time, all of the characters represent TMNT's cast. Some of the characters have similar colors, but others are distinguished by their character traits.