Don't Explain the Joke: Iggy, particularly in the scene where Johnny's future bride is introduced, wearing a veil. Johnny and Adam both make snarky comments hinting about why she might be wearing a veil. Iggy says it flat out.
Dramatic Slip: Colonel Chi is knocked down and stepped on by an elephant, necessitating cybernetic replacements for much of his body. However, he has a good three seconds of hammily screaming to the camera during which he easily could have avoided the elephant's foot.
Rule of Funny: In the restaurant fight, Adam is 'playing' the fight on his game gear, and selecting how things will go. When the time comes to choose weapons to fight off ninjas, he selects the funniest ones, and gets more points for it.
Shout-Out: Johnny, the first time he uses a blade, refers to Zorro.
A stuntman assured Miss Hu that he could take her kicking him in the nuts. He couldn't.
Iggy reminds the others that the gas in their house was left on, and says "What if our house blows up?" It immediately does. Iggy then proceeds to blame himself for having caused the explosion by Tempting Fate, and concludes that he must have Tempting Fate as a superpower:
Iggy: Something happened, I don't know what it is, but now every time I say WHAT IF about something it comes true, and back there I said "What if the the house blows up", and it blew up!