What's Up, Doc?

The fender bender Judy causes as she crosses the street to the Bristol Hotel was added on the spur of the moment. When no stunt cars were available, Peter Bogdanovich instructed a crew member to rent two cars and make sure he got collision insurance. Then he staged the wreck before returning the battered cars.

Throughout the film Howard strikes several rocks with tuning forks, and then listens to the tuning fork as if he's expecting a different tone when he hits different rocks. Tuning forks are made to resonate at a fixed pitch, so no matter what object is struck with the fork, it will always sound the same.

The opening and closing credits are shown printed in a large book whose pages are turned by a woman's expressive hand. The opening credits conclude with the last page showing a drawing of a plaid overnight bag with the prologue: "Once upon a time, there was a plaid overnight case..." The drawing dissolves into the opening scene of the same overnight case in an airport baggage claim shelf.

Edited into The Clock (2010)