The 71-year-old music icon, who has been a lifelong supporter of animal rights, has forbidden his production team from chomping on chicken curry, scrolling through social networking sites and consuming non-prescription drugs throughout the shooting of the video, reported Contactmusic.
"It was meant as a joke but, still, you would be out on your ear if you ignored the memo. Anyone found on Twitter, Facebook or nibbling a ham sandwich would be rejected immediately. Drug consumption might be harder to prove, but still," a source said.
The Beatles legend has been filming the clip at Abbey Road Studios in north London where Johnny Depp and Sean Penn have shot their cameo roles after McCartney asked them to be involved.