Visible crew/equipment: In one of the scenes where Arnold is running through piles of debris an explosion behind him causes him to fly through the air. The mechanism that launches him in the air can clearly be seen flipped up from the ground.
Visible crew/equipment: When Dynamo chases Arnold Schwarzenegger in his off-roader, Arnold lures him in/onto a pile of junk, following which Dynamos car crashes and overturns. When the car is on its side you can see the cable used to overturn the vehicle. In the next shot the cable has disappeared.
Visible crew/equipment: Just before Dynamo turns the car over, you can see several times that there is a stuntman driving the car.
Answer: When Ben is walking to the apartment door, he has a huge case with him which is big enough to hold clothes and even shaving equipment. Ben entered the door code into the keypad which unlocked the door so the code was never changed.