The Conversation is a fantastic 1974 Coppola film that has surveillance as one of its central themes. There’s a lot of great technology imagery, especially the analog audio that Harry Caul (Gene Hackman) uses to decipher the content of the conversation, and also the surveillance trade show that Caul attends. Here’s a sampling of stills depicting the awesomeness:

The lab, with lots of reel-to-reel and plenty of buttons for Bill DeRouchey.

The trade show, complete with booth babe, and some very 1970s design (environments, hardware, clothing, typography).