According to Word of God, Justin's role as the main antagonist of Action was dropped midway through the season because the writers came to the realization that he was too self-absorbed to pose any actual threat.
In "Total Drama Drama Drama Drama Island", Courtney found out that the island isn't actually an island. It seemed like this discovery was going to lead up to something, but it wound up just being a bizarre random fact.
Pahkitew Island has two involving Samey. The first being her friendship with Jasmine (which is dropped completely after she is eliminated to the point where it feels like she never even existed) as well as trying to be her own person (dropped due to spending her last two episodes pretending to be Amy after she's tricked being eliminated in Samey's place.
Owen, Leshawna, Beth and B, although Leshawna and Owen avert this by being unable to run long distances and in Action Leshawna's size gives her problems during a challenge where contestants had to avoid lasers beams.
Averted with Staci and Sam, although years of gaming have given Sam excellent reflexes.
Action Girl: All the girls have their moments, but Courtney is the most prominent.
Sierra:(crying) But [Cody] has to love me back. He has to!
Old lady: You need love tea. More you drink, more he love!
All or Nothing: Apparently, Total Drama operates on this principle, as there is no mention of runner ups receiving any compensation. Even the winner is not guaranteed to retain his or her winnings.
All There in the Manual: The character biographies, audition videos, and online interviews reveal more information about the campers than the show ever will.
Chris uses this to his advantage in Pahkitew Island's Finale to make things interesting. He uses Sky's audition tape to reveal that her "but" to Dave was that she had a boyfriend at home (who she planned to break up with before leaving but ran out of time). Not only did Davenottake it well, but fans who did not see her audition were shocked.
The Alleged Car: Some vehicles featured in the show are low budget, poorly designed, broken down, and not well maintained.
The Boat of Losers, though it's in better condition than most of the other vehicles regularly featured on the show.
The Lame-o-sine, complete with a set of bull horns on the hood.
The single-prop plane from Island and the Total Drama Jumbo Jet are both certainly less than airworthy. The First Class section and the "reserved for hosts only" rooms are the inside parts of the latter in better condition than the other rooms in the plane.
The contestant-built bikes in "That's Off the Chain" deserve a nod, being built from salvaged bike parts and other materials. Some held together, others fell apart, and some exploded.
The go-karts in "Grand Chef Auto" played with this. Some looked a bit beat-up but worked just fine, but Scott couldn't drive at all due to his one missing front wheels.
In "Up Up and Away in My Pitiful Balloon", the remaining contestants had to build flying machines out of junkyard scrap. While the machines were functional, they were all destroyed by the end of the episode.
Gwen and Trent in "Search and Do Not Destroy", the moment is spoiled by Chris.
Geoff and Bridgette in "Hide and Be Sneaky", the moment is spoiled when Geoff gets a whiff of Bridgette's skunk smell.
Justin and Courtney in "The Princess Pride", the moment is spoiled when Chris announces that Justin has to fight Courtney for immunity.
Mike and Zoey in "Grand Chef Auto", the moment is spoiled when Mike gets catapulted off the island. They also attempt to kiss in the All-Stars opening, only to get interrupted by Sierra taking a photo of them.
In "I Love You, I Love You Knots", Sky, having to perform a dare, has to kiss Dave. She then burps in his face due to being nervous and having drank a whole gallon of water.
Topher has been suspected of this for quite a while.
Amusing Injuries: To the point where nearly every character has had at least one, and some of the Butt Monkeys have had more than a few. Tyler is the most prominent example, and the unofficial wiki also has a page listing all of the injuries that happened during the course of the series.
Artifact Title: Episode #22 of the first season was originally called "Haute Camp-ture" and featured a fashion photo shoot challenge. This idea was subsequently scrapped in favor of a "look in on the losers" story called "After the Dock Of Shame". Some networks aired the episode with the original title, which doesn't fit the replacement story.
In the "Phobia Factor" episode, DJ had to face his fear of snakes by picking up the "smallest snake ever." After a dramatic pause, DJ freaks out because the snake blinked. Snakes don't have eyelids.
Harold claims that tarantulas are deadly to humans. Although tarantulas can deliver a fair dose of venom, their venom is quite mild and the overall effect is little worse than a bee sting. Some tropical varieties have more potent venom, but even these pose no threat to non-allergic humans.
In "Crouching Courtney, Hidden Owen", one of the ingredients to the Kung-Fu Noodle Sout pis "Rabid Piranha". Piranhas are incapable of catching rabies, as it is a disease exclusive to mammals.
In "Masters of Disasters", Chris frets that if the teens drown in the locked submarines, his show will be cancelled, but is relieved when they manage to escape. However, in reality, the show would've been cancelled anyway due to the near-death of 9 kids (not that anything else they have to do on the show is much better). The only difference being that if they did happen to drown, Chris would have been arrested rather than simply fired.
In "Scarlett Fever" Chris doesn't seem worried that all the contestants could die if the island exploded, even though this will likely lead to the show being cancelled and him being arrested.
Award Snub: An in-universe example occurs during the Action special when the characters don't win the Gemmie award for "Best Reality Ensemble". However, this could have just been a part of Chris' Batman Gambit to get them on season three. A Gemmie is nice but another season is better.
Eva returns in the Island episode, "No Pain, No Gain", only to be eliminated in the same episode.
Amy returns in "A Blast from the Past", and gets eliminated in the same episode.
Back for the Finale: The first three seasons bring back all of the contestants that competed to watch the final two compete.
Revenge of the Island only showed those from that season returning.
All-Stars breaks this trend, kind of. All the contestants from that season return, but they are trapped in balloons and float of before the challenge begins, with the exception of Gwen, Cameron, Heather, and Alejandro, who are freed by Mal and Zoey, they're still alive however.
Amy got taken down in this fashion by Samey in "Twinning Isn't Everything".
Bad Bad Acting: Team Victory and Team Chris is Really Really Really Really Hot showcase some fairly bad acting during their commercials in "Super Happy Crazy Fun Time Japan". Bridgette falters during her speech, DJ freezes up and is unable to say his lines, Harold goes overboard with the dramatics, Alejandro says his line out-of-sync, Noah recites his line in monotone, Izzy gets her line wrong, Tyler yells his line, and Owen reads his sound effects out loud.
Badass Biker: Trent, according to his biography for Island, as he would buy a new chopper if he wins the money.
Bandage Mummy: At different points, Cody, Trent, Justin, Blaineley, Scott, and Cameron.
Bare Your Midriff: All the girls except Beth, Eva, Leshawna, Dawn, Jo, Staci, Ella, Scarlett, and Sky. While Courtney and Dakota's regular outfits don't show midriff, it is shown on some of their alternate outfits (sleepwear for both, swimwear for Courtney, and an intern outfit for Dakota).
"She's like the stalker girlfriend I always thought I wanted, until I got one!"
After receiving a large bribe from Dakota's dad, Chris lets her back on the show...as an intern.
In the All-Stars episode "You Regatta Be Kidding Me," Duncan finally gets his wish of being seen as a bad boy again, in exchange for being booted from the competition by Chris and arrested and sent to a legitimate jail instead of juvie for blowing up his cottage.
In Pahkitew Island, Sky wishes a few times for Dave to come back. He does just that.
A large brown bear would often serve as an obstacle during challenges.
Cody and Owen are attacked by a polar bear in "Anything Yukon Do, I Can Do Better".
A violent baby panda called T'sing-T'sing pummels DJ in "Super Happy Crazy Fun Time Japan" and tackles Katie in "Aftermath: Revenge of the Telethon".
Bridgette befriends a large black bear called Bruno while trapped in Siberia, Bruno is very protective of his owner and attacks anyone that ventures too close to her, including her beloved boyfriend Geoff.
Bestiality Is Depraved: In All-Stars, when the campers have to go collect eggs from the mutated animals from season 4, one of the eggs starts to hatch before Mike can put it into the bowl and score a point. Said egg happens to be from Chris's pet Man-Eating Plant from Revenge of the Island. One of the numerous plant babies that hatch out looks exactly like Chris. Chris just whistles innocently...
Ezekiel serves as the antagonist of "I See London..." and "Zeke and Ye Shall Find" (the 100th episode of the series). Both events involved him capturing all the contestants in a horror-themed challenge.
All-Stars basically brought back every Big Bad and villain who had ever appeared in the series (coupled with Mal, the evillest villain to date) and put them on one team, where they predictably spend every challenge arguing and betraying each other. They only manage to stay in the game by doing what villains do best: deceit, blackmail and sabotage, but somehow they still end up winning more challenges than the heroes do. However, starting with Cameron in "Zeek and You Shall Find", every one of them gets eliminated in consecutive order.
Pahkitew Island had an unusually high amount of antagonists for a new cast: Amy, Max, Sugar, Scarlett, and Dave.
Bi the Way: It's heavily implied that Owen has a crush on Justin despite already being in a relationship with Izzy.
Justin: I'm back to being just another pretty face.
Katie: And pecs.
Sadie: And abs.
Owen: And butt.
Bits of Me Keep Passing Out: In "African Lying Society", four members of the final five accidentally sedate each other with tranquilizer balls and have to perform a song while struggling to get their limbs to function properly.
Both Action endings are presented this way. In the canon ending, Duncan wins but Beth at least gets to see her boyfriend and in the alternate ending, Beth wins but Duncan gets to go to dinner with Courtney.
In both endings of Revenge of the IslandCameron states that he doesn't need to live in a bubble anymore.
At the end of All-Stars (the mid-season finale of season five), Mike finally manages to get rid of Mal, at the cost of losing his other personalities as well. However, they reassure him he'll always have a piece of them with him, both figuratively and literally, as he retains all of the abilities they had. Additionally, the iconic Camp Wawanakwa ends up sinking at the very end of the episode, setting the stage for the second part of the season, Pahkitew Island.
Amy/Samey, Jasmine and Scarlett in Pahkitew Island.
Body Horror: Alejandro's fate in the World Tour finale. In both endings, Alejandro ends up being smothered in the lava of the erupting Kilauea volcano. Saying the result was unsettling is an understatement.
Book Ends: Staci only appeared in the first episode and the last episode of Revenge of the Island.
Breather Episode: "Brunch of Disgustingness", a gross food challenge smack-dab in the middle of season one. With no elimination and a one-off rejiggering of the teams, this episode is essentially the season's halftime show.
Briefcase Full of Money: This is how the prize money is delivered. However, sometimes the case either gets stolen by a rogue former contestant (Ezekiel in season three and Heather in season four) or comically destroyed (eaten by a shark in season one and burned in a volcano in season three).
Invoked during the wedding-themed "Niagara Brawls". The characters are expected to do this as part of a challenge, though not all couples play it straight: Cody and Sierra gender-invert it while Duncan carries Courtney over his shoulder instead.
After Alejandro rescues Heather from under a rock in "Awwwwww, Drumheller", he picks her up this way. She immediately demands to be put down, but it's obvious from her tone that she's secretly enjoying the attention.
During the last few brain sequences in All-Stars Chester is usually being carried by either Mike or Vito (because he doesn't want to walk all the way to the tower), Mike carries him piggyback style but Vito is strong enough to use the bridal carry.
Buried Alive: This is Gwen's phobia. She's forced to undergo it in both "Phobia Factor" and "The Treasure Island of Dr. McLean".
Burping Contest: In the episode where the teams change to Guys vs. Girls, the guys' team bonds over one of these.
All the campers could be considered Butt Monkeys since they usually have at least one moment of extreme torment physically, emotionally and/or mentally. But Ezekiel, Tyler, Cody, Owen, Duncan, Trent, Harold, DJ, and Brick are the poster boys of this & Courtney, Gwen, and Heather between the girls.
The poor interns. So far they've been tossed to crocodiles, thrown off cliffs, shoved off planes, eaten alive by scarabs, used as footstools for Chris, and chased around a studio by Beth.
At the beginning of Revenge of the Island, we get a cameo showing all of the original cast. We see Alejandro who's still inside the Drama Machine holding Heather in his arms, with Courtney showing disapproval towards this. Implying that they know who's inside. By the time All-Stars starts, the Drama Machine is still with Chris, and the contestants act like it's their first time seeing it. And, are extremely shocked with Alejandro's reveal.
Alejandro also claims that he was in the Drama Machine for a year but this series takes place two years after Total Drama World Tour ended.
At the end of Total Drama Island Courtney find out that the island is connected to a city but Izzie, Owen, DJ, and Geoff all flew over the island yet they didn't notice this. The contestants were also able to use canoes to travel around the island in season 5.
Can't Get Eliminated for Nuthin': DJ tries really hard to get kicked off in the third season, but it never seems to work for him. And of course, the moment he does try winning again, Alejandro gets him eliminated.
Played with. Heather gets a meat grinder as a reward in "Broadway, Baby!", thinking it's a Joke Item (and ignoring Courtney's protests that it might be important) she tosses it off the plane instead of keeping it. The next episode revolves around the teams having to grind enough meat to make a giant sausage, a task that would be monumentally easier if one had a grinder. Heather's team is understandably upset.
"Broadway, Baby!" establishes that Cody really, reallylikes candy, to the point where large amounts of it almost seem to hypnotise him. Half a season later, Alejandro wins a cart filled with candy as a reward and promptly uses it to manipulate Cody into being his ally.
Circling Birdies: In the special bridging the first two seasons, birds circle Courtney's head after she slams into a camouflaged wall. She shoos the birds away, prompting one of them to angrily chirp back at her.
Cliffhanger: "Not So Happy Campers - Part 1" in Island, "Mutiny on the Soundstage" in Action, and "Walk Like an Egyptian - Part 1", Jamaica Me Sweat, and "Planes Trans and Hot-air Mobiles" in World Tour.
Lindsay and, a few episodes later, Owen while describing Heather, with the former getting the long bleep replaced by "...no-good selfish, heartless, pushy, bossy, mean, bully of a girl!" in the American version.
In a parody of the Christian Bale incident from Terminator Salvation, Izzy flipping out at her movie crew for no apparent reason in the Action special. It's bleeped out in the original Canadian airing, but was one of only a handful of times Cartoon Network censored dialogue in Total Drama Action when the bleeps were replaced, mostly by words like "stinking."
Izzy: (yelling) Or I'll kick your (bleeping) butt! I want you all off this (bleeping) set! No, don't be (bleeping) "sorry"! Think for a second! No, no, will not take five, (bleep)! You call yourself a director of photography?! Why were you walking right through the set?! WHY were you walking right through the (bleeping) set?!! (in a more calm voice) Okay, I was just kidding. Guys? I just went ballistic there for no good reason. What?
Comically Small Bribe: After the talent show challenge, Heather assembles an ad hoc coalition to eliminate the innocent Justin to protect her guilty self after she alienates the other contestants. She recruits Owen by giving him a piece of cake. In a game where $100,000 is at stake.
Compressed Vice: Trent develops an OCD level obsession with both the number 9 in Action. Harold claims that this obsession always existed, even though Trent never showed any signs of it in Island.
The first episode of World Tour has Owen terrified of getting on the jet, a reference to his fear of heights in season one.
At the start of World Tour, Chris asks Lindsay if she understands the voting process this time around, a reference to how she accidentally voted herself out in Action.
In "Haute Camp-ture", Noah mentions that he owns a golden Labrador. Two seasons later, in "Can't Help Falling In Louvre", Noah distracts Sasquatchanakwa by pretending to throw a ball for it to fetch, explaining that the trick always worked on his dog back home.
In "Celebrity Manhunt's Total Drama Action Reunion Special", Justin mentions that despite being a Drama Brother, he can't play any instruments. For every Drama Brothers song from then on, Justin is only seen shaking a tambourine to the beat of the song.
In "Grand Chef Auto", Chris mentions that Duncan still owes him camera time for skipping out on World Tour.
When Izzy and Owen sneak off and make-out in the woods in "Hook, Line, and Screamer", Owen emerges from the bushes covered in kisses.
Creepy Child: Dawn's overly-serene demeanor and aura-reading abilities freak out a lot of her fellow contestants, and earn her the nickname "Creepy Girl" from Lightning.
Critical Research Failure: In-universe, several of Chris' location/challenge descriptions in World Tour. The contestants have corrected him on multiple occasions, but they weren't perfect themselvesï¿½ Courtney was right about 8,000,000 B.C. being way too early for the building of the Great Wall, but dinosaurs were extinct by then...
In Action, the Screaming Gaffers won eight challenges to the Killer Grips three, one of which was only won because Gwen took the fall for them, one of which was only a reward challenge, and the final being because they kissed up to Chris. Chris lampshades the lopsided nature of the contest:
Chris: Stay tuned to find out who will win this week. Could it be...the Grips?
Owen: Hey! We heard that!
Beth: It could still happen! We're not losers! (accidentally spits out her retainer)
The Epic Fail that is Team Victory in World Tour. Every single member is gone by the season's halfway point. The only contestant that was eliminated before Team Victory was Izzy, and she was in Team Chris is Really Really Really Hot, and that was only because the army took her in.
The Toxic Rats vs. the Mutant Maggots in Revenge of the Island as well, though this is less because the Rats are a weak team and more because Scott keeps screwing them over from within.
In the Island episode "Up The Creek" Beth picks up a cursed tiki-idol that causes her team's winning streak to come to an end.
In the first episode of World Tour, DJ accidentally destroys the remains of a mummified dog, and henceforth believes that it laid a curse on him as revenge. Said curse operated on Clap Your Hands If You Believe and caused him to accidentally hurt any animal that crossed his path, leaving him miserable and stressed-out for most of the season.
Courtney: Look, I am a very experienced swimmer. I was a synchro captain. I coach minnows! I am a CIT!
Heather: More like a B-I-T-C-
Gwen: Guys, let's get going.
Same thing occurs to Heather when the horn, from the Guys' victory in the Brunch episode, concealed her swearing.
Lightning after when he got eliminated in "Evil Dread." He was going to call Jo an obscenity, but got flushed by Chris.
Duncan in "3:10 to Crazy Town", explaining that he's bullying Harold because he found out about Harold rigging the votes to get Courtney eliminated in Island.
Duncan: Payback's a - (gets cut off)
Cursed with Awesome: DJ wants to go home because he keeps killing/hurting animals (accidentally), but he can't lose! And right when he decides he wants to stay in the game in "Jamaica Me Sweat", Alejandeo reveals that the marking on Irene was a fake, after which DJ freaks out, gets an incomplete time on the final round of the Bobsled Challenge (thanks to Alejandro sabotaging DJ's final round of said challenge), thereby causing him to lose, and since he was the last contestant his team to be eliminated, Team Victory was no more.
The Killer Rabbit guarding Bridgette's key in "Search and Do Not Destroy".
Team Maskwak, particularly Sugar, finds Ella's singing to be annoying. Chris is also especially annoyed by it, to the point where he has to remind Ella that there is no singing in Pahkitew Island, and he eventually threatens to expel Ella from the show if she keeps singing.
Cute Is Evil: Duncan really doesn't like Celine Dion music store standees.
While as not as bad as the other examples on that page, Revenge of the Island is this when compared to the first season; due to radioactive waste, the island is now filled with assorted mutants and monsters, not to mention some of the new contestants' personalities seem a lot "darker" than the previous ones' (take for example Mike's multiple personality disorder, Staci's constant lying to get attention, Scott being a bigger Manipulative Bastard than Alejandro and Heather combined, Dakota being turned into a monster thanks to radiation, ...)
All-Stars, with Mal being the first villain who intentionally tries to kill people. One confessional scene even has Alejandro mentioning that he genuinely thinks Mal needs to go to jail rather than be eliminated.
Taken Up to Eleven with Scarlett, who not only is a legitimate sociopath but also tries to kill the other contestants.
Gwen visibly learns to care more for many of her fellow campers as the show goes on, though she'd never admit it.
Heather in Action. Though most people prefer to think of it as Villain Decay.
Deliberately Distressed Damsel: After Cameron tells Zoey that Mike usually snaps back to his normal self when she is in danger, Zoey (who is at the moment worried whether Mike or Mal is the real personality) uses herself as bait for a school of piranhas. It works at first, but then Mal catches on, dominates Mike's mind again, and rescues Zoey while pretending to be Mike so as not to look suspicious.
Depending on the Writer: Sooo much. Depending on the episode and/or the circumstances, you get a lot of moments where the nice, goodwilled characters suddenly belt out snarky comments and/or act like jerkasses or the local Badass and/or Jerkass suddenly says something polite. It gets even worse when it comes to friendships and/or relationships, where two contestants will be laughing and hugging one day, and trying to slit each others throats the next.
Deus Ax Machina: In the series premiere episode, Duncan uses a convenient fire ax to dispatch a cockroach that had "cornered" Lindsay in the Gophers' cabin.
In Action Justin gets replaced by Courtney after being defeated and voted off in "The Princess Pride".
In Revenge of the Island Scott gets voted off in "Eat Puke and be Wary", Lightning then takes up the role of Big Bad after accidentally giving Cameron the win, upon which Taking A Level In Jerkass, two episodes later, he defeats Cameron (depending on where you live).
In Pahkitew Island, Scarlett is eliminated along with Max in "Scarlett Fever", Sugar then takes up the role in subsequent episodes, followed by Dave in the finale.
A few individual episodes like "Search and Do Not Destroy", "3:10 to Crazytown".
The finale of World Tour. Heather sacrifices a potential relationship with Alejandro to win the game, only to lose the million dollars seconds after winning it. She (and the rest of the cast) is last seen desperately swimming away from flaming rocks spewed by an exploding volcano, with one huge boulder about to hit her before the "camera" cuts away. It is also a Downer Ending for Alejandro. THE ONE TIME he decides to be good and chooses love over money, he gets betrayed, and then disfigured. If he had continued being the jerk he was during the whole season, he would have won without a problem.
The alternate ending of World Tour is even worse, Alejandro wins, but not only does he get betrayed, kneed in the crotch, and disfigured, he LOSES the money when Ezekiel grabs the briefcase and is flung into the volcano with it.
The finale of All-Stars. Even after the finalist achieves victory, the money is still lost in the chaos of Chef Hatchet accidentally sinking the island that has been the iconic locale for much of the series, and the fates of the eight contestants who are left floating away into the sun trapped in balloons are never disclosed.
Dream Team: The premise of All-Stars: the most heroic and the most villainous characters of the series join forces. The new relations includes a friendship between former finalists, Gwen and Cameron, and a romance between Courtney and Scott, among others.
Courtney: Ow! A coconut? We're in Muskoka, people! If you want to drop something on my head, at least make it geographically correct!
(several pounds of snow, a toboggan, and an Eskimo fall on Courtney)
Dude, Where's My Reward?: In the alternate ending to the Revenge of the Island finale, Jo gets annoyed when Lightning refuses to share any of the prize money with her and the other contestants of the season, complaining that she carried both maroons to the finale and that she also got ripped off.
Dumb Blonde: Owen, Geoff, pre-mutation Dakota, Lindsay (although her hair is dyed), and Sugar.
Dwindling Party: Given the fact that it's an elimination-based competition, the entire premise entails this. Teams with somewhere around 7-11 members usually drop down to anywhere from 3-6 by the time everyone merges and teams are dissolved. But some challenges themselves also feature this, such as:
Both remaining teams in "I See London...", with Ezekiel abducting people left and right.
Happens to the cast as a whole in "Zeek and Ye Shall Find" of All-Stars. Ezekiel is the "monster" doing the abducting. Just like the previous example.
Early Installment Weirdness: Why the first season tends to be the most well regarded, it also had it's share of weird quirks. Characters would often time go completely unvoiced leading to drastic characterization when they were finally given character spotlight.
Some of the first few challenges in Island are also far, far less insane than ones in later episodes and subsequent seasons. For instance, the earlier challenges in Island included being the last person to fall asleep, a talent show, and surviving a night camping. Compare to Action and World Tour, where the first challenges involved outrunning a building-sized animatronic monster and climbing pyramids in Egypt.
Earn Your Happy Ending: Cameron, who was easily the biggest Butt Monkey of Revenge of the Island, wins in his ending and later discovers that he doesn't need to live in a bubble anymore.
Easy Come, Easy Go: Most of the winners fail to hang on to their prize money long enough for it to matter.
Owen and Gwen give up the money in exchange for a chance to win more money, the difference is that the former decided to go for it, while the latter had the money taken away by Chef.
Duncan loses the money by the time season three starts, while Beth has to use it to pay for bail.
Alejandro and Heather are robbed by Ezekiel, who then falls into the volcano, effectively destroying the money.
Revenge of the Island averts this, both Cameron and Lightning get to keep the prize money in their respective endings, but the former splits the money with everyone, while the latter doesn't.
In All-Stars, neither Zoey nor Mike are seen with the money, moments after one of them won it.
Pahkitew Island also averts this when Sky or Shawn win the season.
Easily Overheard Conversation: Because the campers are on camera, pretty much everything they say is "easily overheard" to some degree. The most trope-relevant instance is when the campers forget this whilst bonding at the bonfire after Katie's elimination, thereby giving Chris all the information he needs to set up the phobia challenge.
Eat That: This happens often. "Brunch of Disgustingness", "Chinese Fakeout", and "Eat, Puke, and Be Wary" have challenges centered around this; however, the dishes were already prepared in the former two episodes while the contestants had to cook theirs in the latter.
Tyler is full of them, but the worst of the lot would be the time he tried to eat a banana in World Tour and it ended up in his eye.
Geoff and DJ in "Hook, Line, and Screamer". The former walks around mindlessly looking for an ice cream truck while Chef, dressed as a serial killer, simply walks behind him (Chris even called it "The worst mistake yet".) The latter because he ran away screaming like a little girl from Heather and her facial.
Pretty much sums up Team Victory. Their terribly unfitting team name is only the tip of the iceberg, the curse of the Mummified Dog DJ put on his team, and his psychological freak outs over him injuring animals that he comes across with, and Alejandro's manipulation are the primary reasons. They amass just 2 challenge wins, both of which turn out to be reward challenges. As a team they outlast just one opposing player (and only because she was evacuated due to injury). When the team is whittled down to just DJ, he gets discouraged and tries to get eliminated, but forgets to keep his mouth shut during the musical number (instant elimination had he not sung). He wins said challenge and it turns out to be a reward, meaning that even if he had succeeded in failing, all his efforts would have been for naught. In the very next episode he starts trying to win again, and that's when he gets eliminated.
Et Tu, Brute?: Duncan votes off Courtney in season two after spending the entire season fawning over her and shortly after hooking back up with her.
Chris was genuinely disgusted when Heather read Gwen's diary aloud on National TV in "Not Quite Famous".
Chris: That's really messed up, dude.
In the same episode, he feels bad when Justin gets voted off.
Heather when compared with Alejandro. As she puts it:
Heather: Even I'm not that ruthless!
And to complete the triangle, Alejandro when compared with Chris.
Alejandro: You are pure evil!
Even Jo felt Chris crossed the line when he strapped bombs to the contestants in "A Mine Is a Terrible Thing to Waste".
Jo: Too far, McLean!
Alejandro and Duncan feel this way about Mal's tactics.
Alejandro:(sitting in the confessional, distraught) Mal does not belong in juvie... He belongs in jail!
Evil Is Burning Hot: Various villains have all been accompanied by a flaming background. Most notably in "Heroes VS Villains", during the Villainous Vultures first confessionals, all of them are featured by a flaming silhouette accompanied by an Evil Laugh.
Mal is an exceptional example as half his appearances seem to feature the landscape behind him burning.
Everyone knew about Courtney's crush on Duncan in season one, even though the only person she admitted it to was the cameraman.
Courtney: Who do I want to win? I can't believe I'm saying this but... Duncan. Don't tell the others!
Izzy: Oh, we already know. You were all over him.
Noah: My golden lab drools less over rib eye steak.
As of "Chinese Fake Out", everyone knows Alejandro and Heather have a thing for each other, with Blaineley flat-out telling them to make-out before her elimination and Duncan and Chris calling them "lovebirds". Of course, they refuse to admit it.
Trent is scared of mimes due to a traumatic childhood incident.
When Lindsay ends up hanging on a gate in Paris after her World Tour elimination, a nearby mime manages to creep her out by imitating her instead of trying to help.
Everyone Is Single: All the contestants are single when they arrive at the island. The only exception is Sky, who didn't have time to break up with her boyfriend before being sent to the island.
Everyone Meets Everyone: The premiere episode whenever there is a new cast is one of these with all the campers meeting each other for the first time. The only exceptions are Katie and Sadie who were already friends, Duncan and Mike who met in juvie, and Amy and Samey who are twins.
Heather vs. Alejandro throughout World Tour up to the finale, where they actually face each other. Harold lampshades the situation in Versus:
"Now it's evil versus wicked!"
Also occurs in All-Stars with Al vs. Mal, though by this stage, the former Big Bad has lost most of his villainous touch and has become more of an Anti-Hero. Unfortunately, none of the other contestants see it this way and still treat him like public enemy number 1.
"I am not the real villain. A greater evil is lurking."
Pahkitew Island has Max vs. Scarlett throughout the season, as well as Chris vs. Scarlett and Scarlett vs. Sugar in "Scarlett Fever".
Zoey fires an arrow at Chef but it flies over him, prompting Chef to taunt, "You missed!" Zoey just grins at him as the arrow cuts through a vine holding a boulder she had tied up earlier that pendulums into Chef.
In "Zeke and Ye Shall Find", Ezekiel shoots his toxic saliva at Cameron, only to miss. Turns out he was actually aiming at the ceiling above Cam to trap him.
Lightning in Revenge of the Island, after accidentally giving Cameron the win in "Eat Puke and Be Wary". This was presumably done so that he could replace Disc One Final Boss Scott as the Big Bad.
Chris tries to invokes this on Dave and Jasmine during the Pahkitew Island finale and succeeds, though while Jasmine holds on to her good side at the end, Dave goes completely bonkers after discovering Sky already has a boyfriend, making his Sanity Slippage even worse.
When the contestants are tossed out of the jet at the start of "Slap Slap Revolution", Alejandro tries to catch Leshawna but ends up getting crushed under her weight instead. Leshawna still appreciated the gesture though.
Leshawna: Thanks Alejandro!
Alejandro:(pained) No... problem...
"Slap Slap Revolution" has a second example later on: When Alejandro throws Izzy to Noah from atop a giant meat grinder, Noah raises his arms to try and catch her but she ends up smacking into his chest and knocking him over instead.
Heather, Leshawna, and Izzy all get a censored nudity shot (both front AND back for Izzy), though it doesn't cross into Ecchi territory. There's also Gwen's Panty Shot listed below, and just about any time the girls are seen wearing something other than their normal clothes.
Lindsay, Katie, and Sadie's bikinis.
Fat Girl: Sadie, Staci, Sugar, and Leshawna (sort of).
Faux Affably Evil: Many of the antagonists such as: Alejandro, Scott, Mal, and Scarlett.
In Island, Cody hits on all of the girls, but he likes Gwen in particular, and is able to downplay that and let her be with someone else. Come World Tour, he's only and obsessively attracted to Gwen.
While Izzy was always a Genki Girl, in Island she was portrayed as quirky and weird but ultimately stable. Starting with Action, Izzy became full-blown crazy 100% of the time.
In Island, Chris was portrayed mostly as washed-up celebrity and the challenges he devised were mostly designed to embarrass or annoy. By Revenge of the Island, he's become full on Affably Evil with every challenge being potentially life threatening and Chris himself seeming to care more about inflicting pain than generating ratings.
At the start of World Tour, Sierra was Cody's personal Stalker with a Crush but this wasn't her most defining trait; being a huge fan of Total Drama meant she was incredibly Genre Savvy and knew how to play to win, even managing to trick Heather by Obfuscating Stupidity. However, as the season progressed more and more focus was placed on her obsession with Cody, and her own focus shifted from actually competing to just smothering him with (unwanted) affection. Come All-Stars her obsession has become so intense that she ends up using Cameron as a substitute for Cody during his absence, even referring to him as "Cam Cody", "Cody Cam", and "Camody".
Lightning was always an over-competitive braggart but in Revenge of the Island he at least had skills to back up his claims, while in All-Stars his ego seems completely unfounded in the face of his ineptitude and stupidity.
In Total Drama Island, Courtney was bossy and uptight but still one of the more moral characters, and only threatened to sue when she was unfairly kicked off the show. In Total Drama Action, she becomes a control-freak with a Hair-Trigger Temper who threatens to "call her lawyers" at least Once per Episode.
Given that Duncan found out that Harold was the person who rigged the vote so Courtney got kicked off the island in season 1 this may be why he started bullying Harold more in season 2.
Lindsay started out as your typical Dumb Blonde, then in All-Stars she became an exaggeration of the trope who doesn't even understand basic concepts such as the difference between pushing and pulling.
In the second Action Aftermath, when Geoff states that money is more important than integrity Ezekiel is the only contestant that agrees with him. A season later, guess who ends up turning feral and stealing the show's prize money?
In the intro of World Tour once everyone has settled in front of the plane, Ezekiel unexpectedly crash-lands into the shot, this could be symbolic of his tendency to pop out of nowhere during the season after his elimination, especially in the finale where he suddenly reappears to steal the case from Heather before falling into a volcano.
In "Super Happy Crazy Fun Time Japan", Alejandro throws up after eating a candy fish tail, indicating that he has a low tolerance for strange food. This ends up being a plot point during the eating contest challenge in "Chinese Fake-Out".
In the World Tour finale, when Cody and Alejandro are fighting for a spot in the final two, Harold advises Cody to "aim for the kiwis." In the end, this is how Heather takes down Alejandro in the final challenge.
Lightning wanted to be a team of one and not only did he almost accomplish that before the merge, after Jo was eliminated he was the last remaining member of his team (if you don't count Scott who switched teams).
In Dakota's audition tape she boasts that by the time it's over she'll be "the biggest thing ever."
After Mike defeats his other personalities in "Grand Chef Auto", a shadow can be seen on the wall for a split second. Say hello to Mal. For extra points, it happens after he says "This brain is under new management", foreshadowing Mal taking over Mike's body full-time. Further foreshadowing occurs in "Evil Dread", where Mike doesn't lift a finger to help Sam escape a mosquito attack and even laughs when he gets stung by a jellyfish. Guess who reveals himself at the end of the episode?
Courtney jokingly tells Duncan to enjoy prison in Season 1. Guess where he's sent 4 seasons later
Gold Digger: Courtney in Action. She broke up with Duncan after finally getting eliminated, THEN gets back together with him soon after he wins, even having the nerve to say "we're rich!" as if she's entitled to the prize.
Gold Tooth: Heather gets one to replace the one she lost in "The Am-AH-Zon Race".
Gory Discretion Shot: In the season one episode, "Hook, Line and Screamer", the campers are watching a slasher movie. When the slasher encounters an amorous couple, the original version shows the blood spatter effect on the Fourth Wall, but the bowdlerized U.S. version doesn't even show that. The observant viewer will notice, though, that for several seconds the light beam from the old-style film projector alternates between its normal white and a pale red.
DJ becomes the victim of this in "Super Happy Crazy Fun Time Japan".
Chris: Teams, select a ball guy or gal. Victory?
Leshawna: We choose DJ.
DJ: We do!?
In "Broadway, Baby!", when Chris explains that one member of each team has to sit in a baby carriage during the race everyone on Team Amazon points at Cody.
Happens to Gwen during the musical number of the guard-stripping challenge in "I See London".
Courtney: If we're gonna find that clue...
Heather: There's only one thing to do!
Sierra: Force someone to strip him down!
Courtney, Heather, and Sierra:(push Gwen forward) And sorry Gwen, that's you!
Likewise, this also happens to Tyler.
Noah: If we're gonna find that clue...
Owen: There's only one thing to do!
Noah: Force someone to strip him down...
Both Noah and Owen:(point at Tyler) And Tyler, dude, that's you!
Gosh Hornet: When Lindsay has to retrieve a key that's stuck in a beehive. Izzy gets it for her by ramming her hand right into the hive, and an angry swarm chases Lindsay into a lake. Needless to say, she's not looking so hot in the next scene.