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.
Suggested correction: There are a lot of things Doyle is processing when he's in the shop. There's a lot happening, and he has a lot on his mind, and increasing pressure and stress each time. It's quite possible that he wouldn't notice the accent of the announcer, something he has no reason to doubt.
Rubbish. During his first two visits, he sits quietly listening to the race announcements. On his second visit, he would recognize J.J. Singleton's distinctive voice and would realize something was very wrong.