"The camera is usually looking over the top of an instrument panel. So it's very seldom that the camera will see both you and the instruments. You can then rip out a page from the script, tape it on the panel, be looking at a dial and twisting a knob, and you read it."

Space Cowboys star Tommy Lee Jones revealing how he managed to remember his lines.  He puts tack it notes up where the audience can't see them on his films.

Also Jay Tavares of The Missing recently discussed how Tommy Lee wears a hearing device in his ear in case he forgets a line or two.  The line is fed thru the hearing device from someone off set.

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