Hall did that gig for years after his studio days had come to an end, and he told me he loved doing it, but after all that time and for no apparent reason, Denver's management fired him, on an airplane on the way back at the end of a tour. It hurt him badly. After that he moved to Scottsdale, Arizona, and took a job as a security guard. Hal Blaine, forced to work as a security guard. Unbelievable.
His sixth wife divorced him and took him for almost everything he had. Hal was a broken man. but he got himself together, moved back to LA, and got the occasional studio session again, until his retirement around 2006.