Most comedy movie factual errors of 1971

1Willy Wonka & the Chocolate Factory pictureWilly Wonka & the Chocolate Factory (1971)1
2Carry On at Your Convenience pictureCarry On at Your Convenience (1971)1
3Summer of '42 pictureSummer of '42 (1971)1
4The Abominable Dr. Phibes pictureThe Abominable Dr. Phibes (1971)1
5On the Buses pictureOn the Buses (1971)1
6Up Pompeii pictureUp Pompeii (1971)1
7Carry on Henry pictureCarry on Henry (1971)1