It doesn't surprise me at all to know that John was down on this rendition of "Twist and Shout". Something I have both read and been told is that John never liked the pure sound of his own voice. He always wanted it to be processed and affected. If I remember correctly what I was told, Sir George Martin would listen to John's solo records when they were being made in the 70s and feel bothered by all the different post-production effects that were put to John's lead vocals.