Format
In a typical round, Plomley read out a piece of text prepared by Messiter, and contestants buzzed in if they detected an error. Correctly identifying an error scored one point and supplying a correction was worth a second; if a contestant buzzed in when there was no error, two points were awarded to the opposing team. Occasionally a third point was awarded when a contestant spotted a mistake Messiter had not intended.
Mid-way through each show, for one round, Plomley handed over to "our musical mistakes man, Steve Race", who would play short extracts from well-known pieces of music, each preceded by a spoken introduction, while contestants attempted to detect errors in the introduction, the piece, or both. A regular feature was a memory round: Plomley read a short piece, usually of verse or song lyrics, then read it again later on in the show with funny alterations which the teams scored points for correcting. Other regular features were the Many a Slip library with its books of incorrect titles and authors; a murder mystery round with the Many a Slip detective; travelogues of different countries and the Many a Slip chef and his way of cooking with ingredients that no sane chef would use.
For each series the chairman kept a running total of how many games each team had won and in the last show he announced which team had won the series.
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