This is the first episode that features Tony living at the Castle. But is stated that Tony and Janet were dating at least a year earlier, and Janet knows about the elevator in the basement as well as the out-of-order telephone booth that conceals another secret elevator, She couldn't know about them unless Tony lived at the Castle when they were dating (which doesn't match the previous episodes when Tony lived on his jet), or more than a year has passed since the previous episode.
Janet runs down the street, jumps into a parked car at random, and manages to somehow immediately start it.