Revealing mistake: In the scene were Mrs Doyle is listing the rude words and phrases used in one of Father Ted's favorite author's book's, she goes through all of them fine. Apart from the last one, when she says "Get your boll*cks out of my face" you can hear her laughing in the word "boll*cks" before she exits the room.
Revealing mistake: When Henry Sellers jumps out of the window, it's apparent that it's pre-cut glass.
Chosen answer: It's characteristic of someone putting on a fake Irish accent.