Revealing mistake: When Jack's wheelchair is at the top of the cliff and about to fall off, it's obviously a stuntman and not Frank Kelly sitting in it. Similarly, when the wheelchair falls, the dummy used isn't even dressed like Jack. (00:14:25)
Continuity mistake: Father Dougal's hair changes position during the scene in the car, before they go on holiday.
Revealing mistake: When Ted and Dougal are climbing the big rock after seeing St. Kevin's Stump, it's so obvious that a light is being shone on them from behind. They both have shadows even though it's a dark and cloudy day.
Revealing mistake: At the end when Ted flushes the toilet and kills the priest, we see an outside view of the priest and if you look at the bottom of his robes you can see a black square thing hanging down from the inside which must have been squirting the water out of his robes. Also to prove this, you are not able to see any water coming from the drain in the ground, which does not make any sense.
Other mistake: The bishop that Dougal talks to about religion being pointless is supposed to be Irish but when he is telling Ted about his change of heart, the actor's English accent slips back in for a few seconds.
Old Grey Whistle Theft - S2-E4
Continuity mistake: When Ted is talking to Sergeant Hodgkins as he takes off in the helicopter outside John and Mary's shop, Ted's hair is messy and windswept. However, when he walks in the shop moments later his hair is neat and tidy.
The Plague - S2-E6
Visible crew/equipment: During the attempted rabbit race, when the cages open, you can see a crew member's arm as he tosses the rabbit out of the cage second from the left. (00:10:20)
The Plague - S2-E6
Audio problem: When Bishop Brennan calls for the first time at the start of the episode, Ted panics and pretends to be French before hanging up the phone. You can still hear Bishop Brennan talking on the other end of the line for a few moments after Ted hangs up, which obviously shouldn't be possible.
Cigarettes and Alcohol and Rollerblading - S2-E8
Revealing mistake: When Ted jumps onto his bed (when the nun replaced their mattresses with bricks), you can see both beds are bouncy when Ted lands on his bed and Dougal lifts back the covers on the bed half way through the episode. (00:19:20)
Cigarettes and Alcohol and Rollerblading - S2-E8
Visible crew/equipment: When Ted and Dougal look into the window of Dick Byrne's house, the rope pulling Father Cyril's skateboard is visible. (00:21:50)
Visible crew/equipment: When Father Cave gets up to give his speech and he turns to Father Gallagher, you can see the boom mike move in the top left corner. (00:15:15)
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.
Factual error: When Dougal and Ted enter the cockpit, the pilot points out the gauges for 'engines 1, 2 and 3'. They are in a Boeing 737 (the internal layout is that of a 737, not a BAE 146), which only has two engines.
Visible crew/equipment: When Ted is running along the beach, you can see the tracks made by the vehicle that is supporting the camera.
Visible crew/equipment: When Ted first brings the Golden Cleric display case into the living room, the studio lights can be seen in the reflection of the glass.
Continuity mistake: When the commercial for the Priest chatback comes on, the phone number that's read out doesn't match the one that comes up on screen.
Answer: Ted was using his real hands to control Father Jack's wheelchair using a remote control - the fake arms were so no-one would see him cheating.
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