गूफ़

Near the beginning, before Wren's boss goes into his office looking for him, a shadow of the boom microphone is visible on the wall behind him in the hallway.

(at about 16 mins) When Wens is talking to Jean-Baptiste in the room marked 'Archives', a shadow of the boom mic is visible high up on the light part of the wall, next to the files, just as the two men separate.