The house shown in the establishing shot of the teaser as Leslie Fielding's residence is a completely different structure from the property depicted as her house twice later in the episode. The property shown in the teaser has a steep mansard roof and quoins along the edges of the walls; the house shown later has white stucco siding with a flatter, red tile roof.
The property used throughout most of the episode as Leslie Fielding's residence is the same property used to depict the orphanage that Joe Mannix visits on his way to Mexico. In the establishing shot of the house shown immediately after the opening credits there is a distinctive white statue of Jesus, with arms outstretched, in the foreground of the shot; that same statue appears in the orphanage scenes, but shot only from the side and back, to try to disguise that it's on the same parcel as the house.