In the Discotheque scene,the Michael Jackson Song "Beat It" can be heard.
When Walter is pushed from the plane, he's wearing a tan and beige jacket and pants. But a shot of him falling shows him wearing a blue jumpsuit. This was obviously a stuntman insert shot.
In one scene a man moves toward the camera with a gun in his left hand. When the camera angle changes and the man is moving away from the camera the gun is in his right hand.