There is no documented reason for Bryan 's absence , leaving some fans to speculate that he refused to cross the picket lines .
Later , during the musician 's union strike of 1958 , another artist did the voice for Elmer 's co-starring appearance in Pre-Hysterical Hare .
There is no documented reason for Bryan 's absence , leaving some fans to speculate that Elmer refused to cross the picket lines .
Later , during the musician 's union strike of 1958 , another artist did the voice for Elmer 's co-starring appearance in Pre-Hysterical Hare .