During the finale of Island Heather rips Justin's shirt off in order to distract Gwen. It works, but also affects Owen, who stops to stare dreamily.
And Owen takes longer to snap out of it than Gwen does.
In the first episode of World Tour, Izzy asks Owen and Noah to dress her up as a mummy, she leaves and then Ezekiel comes in, also dressed as a mummy, Owen mistakes Ezekiel for Izzy and leans forward to try and kiss him.
Owen gets so caught up in the excitement of forging an alliance with DJ and Duncan that he ends up kissing them on their foreheads.
Justin in general makes everyone (guys included) lose any and all composure they once had.
In Action, the usually non-affectionate Justin hugs Owen excitedly after he escapes elimination, they continue hugging until they realize that the other contestants are staring at them, at which point they immediately pull back in embarrassment.
Cody and Noah in the episode, "The Big Sleep", ended up sleeping next to each other. The next morning, Noah accidentally kisses Cody on the ear in his sleep. Both awake and begin screaming. Not to mention Cody wakes up first, smiles at Noah, and only begins screaming a few seconds after he realizes Noah is. You can bet fans lapped it right up.
Much later, when Izzy is teasing Noah for this, he emphatically denies this ever happened. This is of course coming from the guy who deadpans consistently even when falling to what would presumably be his death. The Sarcasm Failure that occurred when Trent confirmed it didn't help.
They did it again in the Action special. Only this time, Noah's head was in Cody's lap. Not to mention the position they're sleeping is an exact replica of Duncan and Courtney's famous Sleep Cute pose; the aforementioned couple is even lying nearby in said pose to prove it. And when the two are woken up by Chris' helicopter they don't scream or spring apart as comedy demands, instead they just stay where they are and look alarmed at being woken up so suddenly.
There's also a more subtle scene from back in Island, in the episode right after the one with the kiss, there's a part where Noah talks to Heather and Cody is just staring and smiling at Noah in the background, at first it's not a big deal, since all the Gophers are looking at him, but then after Noah finishes talking and looks down at his book again, everyone else turns back to watch the game, but Cody just keeps staring at Noah and smiling.
Additionally, there was that crack about "so we meet again" from Noah to Justin in the Island special, which seemed odd considering they'd never interacted before. This, combined with the fact that Justin and Noah are two contestants frequently thought to be gay by the fan base, inspired a lot of theories that the two had a thing at Playa Des Losers.
And his only other interaction with Noah was pantsing him in the Island special. Not just pulling his pants down, but pulling them completely off, and then staring at them for a few seconds.
Alejandro seems to try a little harder than usual to impress Noah. Alejandro's "What say you?" in the Japan episode is blatant flirting, not to mention the fact that Alejandro called him, "my little porpoise" in Newf Kids on The Rock and Noah looked just a bit too pleased when Alejandro offered him a hand. And in the The Am-AH-Zon race, they were sleeping next to each other. Not to mention the Foe Yay as of, "I See London...".
Chris and Chef Hatchet have become increasingly chummy over the course of the show. Two very prominent examples are during "Camp Castaways" when Chef cradles Chris in his arms for no other reason than he can and in "The Chefshank Redemption" when Chris basically tries to ask Chef out but gets rebuked.
Chris's wallpaper is a photo of him getting a massage from Chef.
While they are just friends, it should be noted that Owen seemed to be more distraught over the loss of Noah than the loss of Izzy, his girlfriend. While Izzy may have gotten a whole song dedicated to her, Owen was worried about Noah up until he himself was eliminated!
"I See London" is rife with Ho Yay, not just from Noah and Owen, but also with the Les Yay between Gwen and Courtney, and with the aforementioned Foe Yay between Noah and Alejandro.
In "Sweden Sour" when Duncan and Alejandro are repetitively sucking up to Owen to win over his loyalty. Chris gets so annoyed he says: "You both love Owen! It's beautiful."
Also from Chris, in the same episode: "Owen, if this were a Valentine's Day dance, you'd have a very difficult decision to make."
In "Walk Like an Egyptian - Part 1",'' Alejandro can't turn his charm off, even when he's helping Tyler.
They continue to have odd moments throughout the series, particularly the "pull your headband over your eyes and trust my instincts" bit in "Jamaica Me Sweat".
In "African Lying Society", when escaping quicksand Duncan hugs Alejandro around his shoulders and lays directly on top of him, not to mention they stay like that for quite a while and Duncan doesn't seem to mind the position.
"Rapa-phooey" provided the show's most prominent Ho Yay example yet: Cody sappily staring up at Alejandro and hugging him around the waist... while sitting in his lap, He then spends the entire episode sucking up to Alejandro, Heather even outright points out that he's fallen for him, and Sierra later calls Alejandro a, "homewrecking husband stealer" for it.
Sierra talks about how everyone on the plane is dating, she then mentions that Chef and Chris aren't, the only reason being, "Chef isn't really Chris' type".
In the episode "Hawaiian Style" Harold gushes about Cody.
"Cody's a deer. And not just for his big blue eyes and tiny tail."
Chris called Harold and Duncan's relationship in Action a 'love fest.'
"African Lying Society" has Ezekiel lying on top of Duncan, both of them fast asleep from the tranquilizer gun.
The relationship between Lindsay and Beth.
Beth: I'll miss your fruity lip goop!
Gwen and Courtney had their moments in World Tour, prior to the events of "I See London" and "Greece's Pieces".
"Heroes Vs Villains" even had Gwen giving flowers to Courtney (although Courtney was allergic to them)...to apologize for kissing Duncan, of course. Seriously, Gwen seems more interested in get Courtney's forgiveness that her relationship with Duncan in All-Stars.
Gwen outright states that the only reason she decided to participate in All-Stars was to make up with Courtney, and she's devastated because she doesn't think it will happen. Courtney's defenses slip for a moment after she overheard this.
In "Suckers Punched", again. Gwen and Courtney have to fight each other in the challenge but refuse to do so due to their reigniting friendship. Chris then uses various clips of Duncan and Gwen kissing to anger Courtney enough so that she attacks Gwen. Gwen fights back and the two girls end up battered and bruised. Gwen eventually admits she only wanted to make things better with Courtney, and Courtney responds that she had gotten over Duncan and never truly missed him after World Tour but had actually missed Gwen. They then collapse to their knees out of exhaustion and embrace each other, saying that they're "friends forever".
In "You Regatta Be Kidding Me", Gwen saves Courtney from falling in the water. Courtney thanks her, exclaiming "I almost got my hair wet!" They then start complimenting each other's hair, leaning closer and closer to each other with huge smiles on their faces, before being interrupted by Chris.
In "Sundae, Muddy Sundae", the way Courtney looks at Gwen is the exact same way she looks at Duncan in the Action intro.
Sadie and Katie are extremely close and are seen hugging quite a lot in Island. In "The Sucky Outdoors", they each have a moment of gushing over how pretty the other girl is.
The first episode of Total Drama All-Stars has a moment in the jail where a prisoner makes a kissy face at Chef.
In "Evil Dread", Jo tells Gwen not to try to kiss her.
In All-Stars, Mal calls Alejandro a "handsome jerk".