Continuity: When Matthau first arrives at the Beatty house and is preparing to write on the porch he glances at a picture of Beatty. In the picture, stair railings are visible on the right and Beatty is looking to the right. When Matthau goes to pick up the picture Beatty is now looking to the left with the railing visible on the left. When he sets the picture down by his typewriter and looks at it the railings and head position are back to the original place. It appears the same in every other shot except later in the film when he is placing a call to Glenda Jackson, he looks at the picture and Beatty is facing left with the railings on the left. Later they are once again on the right with Beatty facing right.
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