Just to keep in mind, the other house was furnished indicating it was likely still occupied... in which case you as the Realtor would need to give owners a healthy advance notice before just dropping in with clients. Here most owners like about 24 to 48 hrs when possible so they can arrange to get out, decide what to do with pets, kids, housekeepers, clean the place up, remove valuables, etc. Even your own listing it's not common to drop by for any last minute showing - does happen on occasion, but not common. Meaning Beverly would have arranged the showing a day or so in advance with her owners, unless they had moved out already.