The scene where Brother Gilbert sits on Draco, who has disguised himself as a white boulder. Gilbert is attempting to write a song about Bowen, and taps his quill on Draco's head to sharpen the point. The "boulder" opens one eye in surprise and annoyance, creating a bit of visual hilarity.
And when the villagers decide to sacrifice Kara (who is a rebellious troublemaker) to Draco in order to get him to leave. The following exchange happens between Bowen and Draco.
Draco: Who's the girl? Bowen: A nuisance, get rid of her! Draco: Why? Bowen: They're trying to placate you with a sacrifice! Draco: Oh, now who gave them that bright idea? Bowen: Just get rid of her! Draco: How? Bowen: ...eat her! Draco: Oh please, yuck! Bowen: Are we squeamish? You ate Sir Eglemoor, hypocrite! Draco: I merely chewed in self-defense! But I didn't swallow.
Later on when Bowen comes to check up on them, Draco admits to being... distracted.
Draco diving out of the lake after being "killed" by Bowen and seeing a herd of sheep: "Well hello, my pretties." Dinner ensues.
The third attempt at fake dragon slaying, with Kara trying to reason to the villagers they're frauds and Brother Gilbert suddenly coming to Bowen's rescue of his daring fighting prowess (who has no idea of their bargain after their standstill).
Kara: Don't you see? He's in league with the dragon! everyone stares at her, before bursting into full blown laughter.
Then there was the actual crossbow attempt, which goes well... until Draco hits shallow water head first.
Bowen: *whispers* Come on sink! SINK! Draco: *whispers* I can't, it doesn't get any deeper.
And the amused look on Kara's face upon seeing this.
And the piece of resistance: all the villagers chasing the dragon for 'meat', prompting him to fly away for his life (and in turn blowing the ruse)
There's a very quick bit when he's running across the shallow water, and suddenly stumbles and falls into a dip in the lake bed. The snarl he lets out seems to be about half, "Dammit, I fell!" and half "Oh, sure, here it's deep!"
In the sequel, there's a scene where Lian is fighting a bunch of soldiers. She knocks one guy's sword out of his hands, and it flies straight as an arrow and sinks into a post next to Geoff. A few moments later, a second sword flies at the pole and sticks into it as well, next to the first. And if that isn't enough, one of the soldiers has a decorative point on the top of his helmet, and ends up getting thrown headfirst at the pole and getting stuck in it as well.