“Extras in the background are usually just mouthing phrases at each other, like “peas, corn, and carrots” and “a pink and purple elephant”. They can’t talk because the background sound gets added in post. If they are required to talk, they have to talk in low murmurs but not whispering as whispering gets poorly picked up on the mic. For the most part, directors want extras to use slightly more exaggerated body language to show a conversation is taking place.”
what I am hearing is that they smoke weed on set.