Continuity mistake: In the scene where Sir Galahad is about to enter Castle Anthrax, it's pouring like there's no tomorrow. Although when he falls against the door and is about to open there is no rain, and no Niagara Falls pouring down the door. As a matter of fact, it's pretty dry on the door and almost a completely clear sky.
Father of the Groom: One day, lad, all this will be yours.
Prince Herbert: What, the curtains?
Father of the Groom: No, not the curtains, lad. All that you can see, stretched out over the hills and valleys of this land! This'll be your kingdom, lad.
Prince Herbert: But Mother -
Father of the Groom: Father, lad. Father.
Prince Herbert: But Father, I don't want any of that.
Father of the Groom: Listen, lad. I built this kingdom up from nothing. When I started here, all there was was swamp. Other kings said I was daft to build a castle on a swamp, but I built it all the same, just to show 'em. It sank into the swamp. So, I built a second one. That sank into the swamp. So, I built a third one. That burned down, fell over, THEN sank into the swamp, but the fourth one stayed up! And that's what you're gonna get, lad. The strongest castle in these islands.
Sir Lancelot: We were in the nick of time. You were in great peril.
Sir Galahad: I don't think I was.
Sir Lancelot: Yes, you were. You were in terrible peril.
Sir Galahad: Look, let me go back in there and face the peril.
Sir Lancelot: No, it's too perilous.
Sir Galahad: Look, it's my duty as a knight to sample as much peril as I can.
Sir Lancelot: No, we've got to find the Holy Grail. Come on.
Sir Galahad: Oh, let me have just a little bit of peril?
Sir Lancelot: No. It's unhealthy.
Sir Galahad: I bet you're gay.
Sir Lancelot: Am not.