At the beginning of the movie, Red purchases tickets inside the Railway Station. As he and Johnny are walking from the ticket booth, Red checks the time on his wrist watch and about two steps later the microphone dips down into camera view.
About half way through the movie, Johnny goes to Pookie's motel room. As he knocks at the door, the microphone is seen. Then as he is in her room and says, "What's the Beef" the microphone is very clearly seen for almost a minute.