One of the lamps caused a fire and destroyed some of that equipment
https://www.rollingstone.com/music/music-news/stones-studio-catches-fire-244378/
It was interesting to see Jagger jerk around like he was on drugs while singing. That leg movement while standing wasnt to the beat.
You can see John Lennon grooving to the song the first time he heard it..and the guy from the Who is dancing around, too
https://www.youtube.com/watch?v=Jwtyn-L-2gQ
I thought the same. I'm guessing cocaine.