The only setlist change on the 1966 tour was Long Tall Sally instead of I'm Down for the show closer. Not a major change I'm afraid. More of a lateral move if you ask me (basically the same song).
Looking forward to seeing your work on this one Jason.
I've heard the stories of how the audience was so loud that they couldn't hear themselves play, and the reason they ultimately stopped touring was because the audience was really listening to their playing.
That was part of it, plus they were tired of being part of the travelling madhouse. Because no one could hear them live, it was pointless to play anything seriously anymore. They had no lives on the road - it was hotels and the shows and nothing more. They got sick of the press conferences, the teeny bopper magazine crap, the interviews with the same questions over and over and over. They wanted to concentrate on the music, and that meant the studio. Little did they know that things would radically change within a year on the concert scene with big P.A. systems that were louder than the screaming fans, concert setlists began to grow in length (though The Beatles were no strangers to long performances. In the Hamburg years of 1960-62 they could play up to 7 hours over the course of a night, every night! They took uppers to stay awake), and rock music was becoming something far more serious than it was just a year or two before. They would have been amazing to see live in the early 1970's - even 1 time. That rooftop show in January 1969 was such a tiny taste of what could have been.