The fish that Ling is swinging around towards the end is pretty funny for its sheer randomness. Then there's the fact that Mulan, who started the brawl, is cowering in the middle of the group, and everyone seems to have forgotten about her until Shang comes out.
When Grandmother Fa sees Captain Shang at the end of the movie, it's between this and Squick.
Grandmother Fa: Hmph. She brought back a sword. If you ask me, she should have brought back a man.
Shang: Excuse me, does Fa Mulan live here?
[after a brief silence]
Grandmother Fa: Woo! Sign me up for the next war!
Yes, Disney has had an older woman hit on a younger man.
Then he tries to talk to Mulan.
Shang: Uh, Mulan! Um... you forgot your helmet! Um... I guess it's your helmet. [to Mulan's father]
What really sells it is her father's face as he takes the helmet.
Yao when his arrows missed Mulan and the Captain.
Yao(weeping): I let them slip through my fingers...
(Yao involuntarily opens his hands just in time for the arrow to return. Cue Yao flying and having most of the army jump on him.)
Then Chien-Po casually picks up the whole army and hauls Mulan and Shang to safety.
The best part is how Mushu keeps calling Mulan's horse a "cow" and "heifer". Also, "DOWN, Bessie." after the horse snaps at him. And how he says his eyes can see straight through Mulan's armor and Mulan slaps him.
Seven words: "Does this dress make me look fat?" *slap*
Not to mention the food boobs! When the apple falls out of Ling's dress, he subtly covers his (missing) right boob. Then, when he and Chien-Po take out the rest of their breast-fruit (watermelons and apples), Yao pulls out a banana—Ling gives him a very odd look.
And the apple has a bite out of it, for some reason. Looks like Ling didn't put much effort into his food-breasts, either.
During "I'll Make a Man Out of You", when they're shooting arrows at pomegranates, and Mushu sticks a fruit on Mulan's arrow. When Shang sees this, Mulan's face is PRICELESS.
During the initial play of the song, when the troops are supposed to catch fish with their bare hands and Mulan pulls Yao's foot instead making him be dragged into the river, but what really sells it is her gingerly pushing the foot underwater trying to pretend nothing happened.
And right after that, Mushu gives Mulan a fish that he caught with snorkeling gear.
The sheer irony at the beginning of the song is priceless.
Chi Fu:I've a girl back home who's unlike any other.
Yao to Mulan, under his breath:Yeah, the only girl who'd love him is his mother.
Mushu with the kite strapped to his back. He looks absolutely terrifying to the guards. Also doubles as a Moment Of Awesome.
Mushu:(flies onto tower) Citizens, I need firepower.
Guard:(gasps and turns around) Who are you?
Mushu:(spreads out fake wings and says in a deeper voice)Your worst nightmare!(cue the guards jumping out of the tower to get away from him)
When Shang tells Mulan that "[she] fight[s] good." Even the Emperor is pretty much saying a more eloquent version of 'You're stupid.' Also, the fact that Mulan a few minutes previous kind of nailed Shang in the head while falling from the roof. Ouch.
Mulan: (to Shang) Would you like to stay for dinner?
Mulan's Grandmother: (shouting across the yard) WOULD YOU LIKE TO STAY FOREVER?
So awkward and inappropriate it startles Shang back into a semblance of his usual cool, snarky self.
In the PC game "Mulan Animated Storybook", when you select Yao, Mushu breaks out some wisecracking lines, such as:
Mushu: I've heard of black-eyed peas, but this is ridiculous!
Grandmother Fa in one scene says about the matchmaker: "Who spit in her bean curd?"
Darn near everything that comes out of Grandmother Fa's mouth is hilarious (the arguably insensitive line mentioned above aside).
After Mulan is getting ready for visiting the matchmaker her father prays at the family temple.
Fa Zhao: "Please help Mulan impress the matchmaker today." (Cue the dog running in around him, chasing a bone tied to his head, chicken fed tied to his back and chickens fluttering into the temple... caused by Mulan.) "Please... please help her."
"I think I'd better go and... pray... some more..."
"Lemme here ya say aaaahhh!" "AAAAAAAAAHHHHHHHHH!!!!!!!" "That's close enough!"
Mushu: (about seeing Mulan's war face) "Oh, I think my bunny slippers just ran for cover."
Mushu throwing Cri-kee out of Mulan's porridge. "Hey get out of there! You gonna make people sick!"
And Mulan with her mouth full of porridge, Mushu saying "then you gotta kick the other kid's butt" and Mulan saying with her mouth full "But I don't want to kick the other kid's butt."
Mushu telling her that she's late. When she rushes out:
Mushu: Wait, you forgot your sword! *sniffs* My little baby, going out to destroy people...
The exasperated look on the Chief Ancestor's face as he says that Mushu can be a guardian again.
"Now, I'll just pull them to safe-" *rope runs out before Yao can grab it* "-ty..."
And then "I let them just slip through my fingers!" *arrow with rope attached to it lands in his hands*
Followed every man jumping to add their strength and pull Mulan and Shang on Khan back up, with Chien-Po casually walking to them and picking them up effortlessly.
Not to mention the faces of the rest of the army when Chien-Po picks them up.
Shang gets a Shirtless Scene in one scene and fires a arrow at the top of a pole for his warriors in training to get. Yao's turn comes up and Yao states "I'll get that arrow, pretty boy, and I'll do it with my shirt on."