And, in a parallel scene with Riku, Beat, and Rhyme, they're having fun bantering while the Spellican is just sitting there, until eventually it gets pissed and shrieks at them before flying off.
Later in the same trailer, just like in the movie, Goofy grabs Mickey, throws themselves off a tower through a window, and lands on a tree that catapults them back into the tower, knocking Pete's lackeys - the Beagle Boys - out of the tower instead, on the opposite side.
Right before Riku runs into Young Xehanort makes you giggle a bit too.
Shiki: Over here! *runs off around the corner*
Riku: Hey! We should stick together!
Some of the (thus far) confirmed Dream Eaters are made of this, particularly their names.
Even the Dream Eaters have their silly moments. Especially the Sudo Neku doing a moonwalk.
Pet your Ursa Circus enough and it'll do a manly flex, looking all tough before it's arms and stomach sag to the floor. Made even funnier when it gives the player a sad/embarrassed look after this.
The first time Riku and Shiki meet:
Shiki: Thank you for saving me. I'm Shiki, how 'bout you?
Shiki: Thanks Riku.
Riku: Sure. *walks away*
Shiki:(exasperated) Hey! That's it?! You chat up a girl and then just say "Sure," and walk off?
The fact that Riku was almost acting like Neku in the Old Time.
Shiki: Aren't you my knight in shining armor? Well?
Riku: K-knight? You've got the wrong idea.
Shiki: (exasperated) Ohmigosh, I was so just kidding. You get out much?
Small bit of Mood Whiplash, but hilarious nonetheless: after Riku restores Sora's shattered heart, he wakes up... and Sora, Donald, and Goofy are having a tea-party, but you don't see Sora's face until he turns around. The punch: Sora is wearing Groucho-Glasses and a Party hat.
Lea shocking the HELL out of everyone (and from the looks of it himself as well) by discovering that he managed to obtain/earn his own keyblade complete with an identical, in unison, "EEEEHHHHH???" reactions from ALL OF THEM. Lea, meanwhile, just goes "Oh."
Slightly earlier, Sora and Riku give a Big "WHAT?!" ("YOU!?" in the English Dub) in response to Lea saying he came to Yen Sid's tower to wield a keyblade. It's the way their eyes bug out and the camera focus that really gets you.
The dialog in the scene is gold as well. With Lea going on that he wanted to be all cool and bust out a Keyblade, but summoning one is harder than he thought. Only for the Keyblade to summon itself.
Even funnier if you took Lea's dull surprise "Oh" as more a begrudged "Oh, NOW you work."
When there's serious shit going on in The Organization 13 throne room with about 13 different Xehanorts, Riku and Mickey held captive by Xehanort's Guardian, and a comatose Sora, Donald and Goofy just randomly warp in, pulling off a Big Damn Heroes moment. What they say, along with their expressions makes it hilarious:
They fell on the Guardian's head! How much more hilarious does it need to be?
During the second visit to Traverse Town, Riku finds Rhyme and Beat fighting the Spellican. They start talking to each other to the point where they start ignoring the creature. Cue angry trembling, and finally an epic freak out on the Spellican's part, shrieking angrily, striking the ground with lightning and summoning enemies.
The Spellican gets another moment at the beginning of the Symphony of Sorcery world for Sora. As Mickey dramatically reenacts Fantasia, Sora and the Spellican have a brief staredown in sync to the music - before Sora gets smacked, head-on, into unconsciousness by it.
The Holey Moley messing with Riku in the Country of the Musketeers.
Crosses over with Funny Background Event, but when Axel/Lea has woken up and is realizing that he's a somebody again, in the background you can see Lexaeus/Aeleus (of all people!) staggering and stumbling about!
Lea offhandedly wonders could Braig and Isa have ended up in another world and Ienzo breaks off into a borderline-Infodump explanation of why it's unlikely. Learning from his mistake, Lea shuts him up before he can start again the next time this is about to happen.
Sora having issues not addressing the King by his title in The Country of the Musketeers and Symphony of Sorcery.
Sora: King Mic-I gotta stop that. Mickey-what can I do to save you?
Randomly making two phrases clash with each other in the fight against Ansem SOD.
Ansem SOD: Can't protect anyone!
Riku: (Uses Curaga) Yeah.
Ansem SOD: "That all you got?"
Riku: (use Shadowbreaker) "Yeah!"
Take your pick of Dream Eater Link Actions for Sora — Him bouncing up and down on Meow Wow to blast enemies with the shockwaves of its landing, Kooma Panda spinning him around by the leg as he just holds out the Keyblade, riding Yoggy Ram and spinning through the air to attack. Perhaps the best case, certain Dual Links with Meow Wow have it inhaling around it to suck up the other Spirit and grow to giant size...at which point the attack is just like their normal Link, the giant Meow Wow bouncing up and down on the ground to squash enemies as Sora hangs on for the ride.
In Traverse Town, when Sora asks Neku's name, Dream Eaters pop up.
Neku: Dream Eaters!
Sora: That's a weird name.
Neku: Not me, them.
This precious moment in The Grid:
Kevin Flynn: Where are you going?
Sora: I'm going after CLU.
Kevin Flynn: Do you even know where he is?
Sora: Nope, no idea.
After beating the boss in Prankster's Paradise, Sora lands in the water with Monstro right in front of him! The whale begins to sneeze as the teenager franticly tries to swim away with a laughably terrified face. One sneeze later, Sora is sent flying while screaming like a girl (in a rare moment when we actually hear the otherwise fearless boy scream).