Malamud pushes an air conditioner out of the wall and there is a rope tied to his foot, but as he falls through the sky light in the next shot, there is no sign of the air conditioner that he pushed out.
(Based on the VHS release) A boom mic is visible at least three times: a little over an hour into the movie as they wheel Sean Young's character down a hallway on a gurney, around 7 minutes later as other characters walk down the same hall and near the end during Young's operation scene.