GravityEasterEgg

There is an "Easter Egg" in the movie that starts at about 3m50s and last till about 3m54s. If you look at the reflection on the visor of astronaut Mike Kowalski (George Clooney) you will see an Astronaut holding the camera that is pointed at Kowalski and a second Astronaut holding a boom with a microphone on it.

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What is it

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A boom mic/camera