During a production meeting where the employment of a certain movie director (Tadashi IMAI, according to a source) was proposed but attendants were rejecting the proposed director because of his 'left wing' ideology; Mitsuo allegedly laughed them off by saying "Right or Left does matter, I belong to the Dainippon Movie Party."
また、製作会議で起用しようとした映画監督（一説に今井正とされる）が思想的に「左翼であるから」と嫌う周囲を笑って、「右も左もあるかい。わいは大日本映画党じゃ。」と言い放ったという。