Yes, he did. I remember Carson having him on back in the 60s or early 70s. Carson was furious that NBC execs made him have Garrison on. He proceeded to give him a hard time. At least that’s they way I remember it.
Carson actually came out and stated he didn’t want to give him exposure, but was forced to do so. He then introduced him and they talked.
http://www.jfk-online.com/jfkaudio.html
It was 1968 and Johnny Carson ripped him a new one, nicely. Listen to what a crackpot Garrison is in his own words. Carson give him plenty of rope to hang himself and Garrison complies.