In the first series, after Michael is splatted by the train, Lisa goes to the insurance company to get some money. When she is told "No pay out" by the head honcho her and the greasy lawyer leave. As she is going down the hallway Lisa puts on her overcoat, when they get into the elevator the coat is over her arm and she puts it on again! So unless she had gotten really hot on the two meter walk to the lift and taken it off someone cocked it up.