Possible Clues:

• Grammatical mistake
• Faux pas
• Grammatical error
• Social gaffe
• Grammatical slip
• Bad mistake that the only 100 is 1000
• Only Conservative doctrine that's seen as mistake
• Crooked smile 'cos of grammatical error
• Is that the only 100 to be 1000? What a blunder!
• Error in grammar or manners