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In page Jerry Lewis:

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During the 1960 production of The Bellboy, Lewis pioneered the technique of using video cameras and multiple closed circuit monitors,[1] which allowed him to review his performance instantly. This was necessary since he was acting as well as directing. His techniques and methods of filmmaking, documented in his book and his USC class, enabled him to complete most of his films on time and under budget since reshoots could take place immediately instead of waiting for the dailies.[citation needed]