When Paul Drake enters Mr. Brent's outer office, his hands are empty. As he walks through the door into the inner office, a large envelope is suddenly in his hands.
When Binney pulls out the briefcase from under "Mr Walsh" (Brent) whilst the latter is lying "unconscious" on the motel room floor, Brent helpfully lifts up his entire upper body to allow Binney to take it.
When streaming this episode, there is a pretty funny shot of a newspaper article. If you freeze the stream at about 1:25, you can see a headline "Sisters Announce Wedding Plans. . .", where the article under the headline is about international industrial production. In the original show, no one would have been able to notice this mismatch. (This is also the case with VHS/Beta videotapes, DVDs, and HDTV, which also have freeze-frame capability.)