Continuity mistake: In the scene where the old women are grabbing at Eoin at the front door in one shot the top pane of the window on the left of the door is broken and an arm is coming through it, in another shot the bottom pane is broken and the top one is intact and arm is coming through the bottom pane and in the very next shot the top pane is broken again and the bottom one is intact again.
Continuity mistake: Ted and Dougal are sitting in the fourth row from the back for the journey. But when Ted presses the emergency button and after the credits, three completely different men are sitting in their seats. Everyone has been given seat numbers so they should not be sitting there.
Continuity mistake: As Father Crilly is shouting at Father Jack "No, not your room, not your room." to get up out of the spare bed, watch closely and as Father Ted strikes him in the face, notice that his hand doesn't even touch his face, and his hand stops several inches away from his face, using only his reaction and the sound of a punch to illustrate a punch at all.