Visible crew/equipment: After the first Alice clone dies in the movie and Dr. Issacs takes off his helmet, look at the scientist to HIS right(our left) you can see the boom operator in his reflective mask along with the camera operator. (00:04:50)
Visible crew/equipment: When Alice is walking in the desert after her bike brakes, the shadow and edge of some filming equipment can be seen in her reflective glasses. It can't be her shadow as that's seen behind her in other shots. (00:33:44)
Visible crew/equipment: When we first see the wet floor in Tokyo, look carefully to see the reflection of the boom arm moving. (01:23:00)
Chosen answer: The reason that the cloned alices were put through the tests was their attempt to get a "perfect" clone of her. They knew that Alice was the key to taking back the zombie infestation, so they were trying to get the "perfect" clone. The perfect clone would have all of her memories and reactions, so they put the clones through that testing facility. If she made it out alive, then she was the perfect clone. If she didn't, then it was back to the drawing board.
Nick Bylsma