It is well known that when he had a conflict with the powerful camera operator, Kazuo MIYAGAWA, over the script of "Zatoichi Meets Yojinbo," finally he pushed through with his continuity, and art director Yoshinobu NISHIOKA recalled another anecdote occurred while a TV drama "Kinagashi Bugyo" was in shooting (Nishioka was involved in it as President of the production company at that time); in which Okamoto almost stepped down in anger for some reason in the middle of the production, and the producer team hastily visited him at home and kneeled down on the ground in front of the entrance to beg him to calm down (from Yoshioka's book on the back lot anecdotes in TV drama production "Monjiro mo Onihei mo Inugamike mo Koshite Dekita").
「座頭市と用心棒」で大カメラマンの宮川一夫と衝突し、結局は自分のコンテを通したことは有名だが、美術監督の西岡義信はTV映画「着流し奉行」（西岡はプロダクションの社長としてタッチ）で岡本が途中降板騒ぎとなり、プロデューサー陣が自宅玄関前で土下座してなだめたエピソードを語っている(「紋次郎も鬼平も犬神家もこうしてできた」より)。