Gary Burghoff plays the same character in the movie and the series. Every character in the early seasons of the series appeared in the movie. (Maj. Charles Emerson Winchester, III, Commanding Officer Col. Sherman Potter and Capt. B. J. Honeycutt were introduced after several seasons.) Capt. Duke Forrest was in the movie and not the series, and Capt. Oliver “Spearchucker” Jones appears merely in first-season cameos.
Love Col. Flagg the best.