This slip-up is towards the beginning if the movie, right after Arnold Schwarzenegger jumps into the lake. At the end of the press conference the younger male puts down the microphone, but right in the next clip the guy has it right up to his mouth.
Yup, I just saw it myself. The camera shows him from about 20 feet away as he clearly sets the mic down onto the edge podium. The camera then cuts to a close up of him from about the mid torso up. As he says his next line, at the bottom center of the screen, you will see the head of the mic pop up into view as if he were still holding it in his hand. Then the camera cuts back to the long view again as he walks away. But the mic is still on the podium.
Sounds like a slip up in the coreography of the scene and/or sloppy editing.
They must have shot scene several times from different angles. And the actors timing as to exactly when he was to set the mic down and walk away must not have been exactly the same in one or more of the takes.
I'm suprised the editors didn't catch it.
Good Eye!