Bottom right : Carson does a skydiving demonstration , 1968.Only thirty-three complete episodes of Johnny Carson 's Tonight Show prior to May 1 , 1973 are known to exist.  All other shows during this period , including Carson 's debut as host , are now considered lost because of wiping .
Only thirty-three complete episodes of Johnny Carson 's Tonight Show prior to May 1 , 1972 are known to exist .