The liner notes of the original Debut release were written by Bill Coss who indicates there was tension before (Miles waited one hour in front of his hotel waiting to be picked up and driven to the recording studio 'which was only two blocks away') and during the session (like 'Mingus was bothering the drummer', '...on one take Miles wandered so far afield that he was completely lost...', '...fortunately another (take) was made').
And that's how some great music was produced.
The original LP cover: