Visible crew/equipment: During the scene at Marcus' BBQ you can see a reflection of a light screen in Mike's sunglasses when he puts them on. (00:17:40)
Visible crew/equipment: At the end of the MacArthur Causeway chase, there is a shot of a police car spinning on its underside. A camera is seen sliding on the road, moving offscreen. (00:36:45)
Visible crew/equipment: After the major collision on the highway with the Haitians, Mike's Ferrari pulls up to the dock, and when you first see Marcus open the car door you can see many crew members in the reflection of the side mirror. (00:37:20)
Visible crew/equipment: When Mike and Marcus are shooting in the pink house, just before Mike is about to throw a gas canister in the room behind the door, look carefully at the tilted mirror on the wall opposite. You can see a crew member kneeling down to get something and then coming back up. (00:49:05)
Visible crew/equipment: Just after the chase scene with all the bodies falling out of the black van, you see one of the bad guys jump over a fence while he is running away, as he lands you can see the mat that he is landing on to soften the blow. (01:28:20)
Visible crew/equipment: In the last scene of the movie where Mike and Marcus are both in Marcus's "new" pool, as soon as the pool collapses into the ocean, you can see in the background a crew member standing there as if he was there to "break" the pool and in a quick shot back to where the pool was, he is gone. (02:20:35)
Visible crew/equipment: During the chase with the Ferrari, a car explodes and flips over. You can see the cannon on the bottom, used to flip the car.
Answer: He was looking through a tiny mirror he was holding in his hand.