Between November 1963 and February 1964, Sellers began filming "A Shot in the Dark", an adaptation of a French play, "L'Idiote" by Marcel Achard. Sellers found the part and the director, Anatole Litvak, uninspiring; the producers brought in Blake Edwards to replace Litvak. Together with writer William Peter Blatty, they turned the script into a Clouseau comedy, also adding Herbert Lom as Commissioner Dreyfus and Burt Kwouk as Cato. During filming, Sellers's relationship with Edwards became strained; the two would often stop speaking to each other during filming, communicating only by the passing of notes. Sellers's personality was described by others as difficult and demanding, and he often clashed with fellow actors and directors. Upon its release in late June 1964, Bosley Crowther noted the "joyously free and facile way" in which Sellers had developed his comedy technique.