Visible crew/equipment: Towards the end of the film, as Snyder hustles Lonnegan out of the room (Spoiler alert!), believing that Hooker and Gondorf have been killed, an extra in a pale grey suit with a red tie stands with his hands up. The shadow of a Sennheiser microphone shows up clear as day on his costume.

Visible crew/equipment: When Robert Redford is being chased by Lt. Snyder, he jumps from a high place to the ground. One can easily tell it's not Redford but a stunt double.
Chosen answer: I watched this the other night and specifically listened for what horse won the race that Lucky Dan was running in. It is never revealed who the winner is, because while the fake announcer in the back room is calling the race, the F.B.I. agents raid the building. During the ensuing chaos, shouting, and gunfire, it is impossible to hear the broadcast over the noise.
raywest ★