In the opening scene, where the bus is seen crossing what looks like a bridge, it is actually crossing the Big Bear Dam. In 1960 the road actually crossed over the top of the dam, right at the point where you had to turn off of Big Bear Blvd onto N. Shore Drive to go to the village of Fawnskin. The route the bus took no longer exists. When seen from above, the area where the road was, seems to have collapsed. And the road was moved over 25 feet or so to avoid the cavity behind the dam. There even appears to be some of the old support for the old road still running across the bridge.
For most of the shows that take place in a rural California location, it is a fictional town. Fawnskin, California is a real location. It is an unincorporated community on the northwest side of Big Bear Valley, in the San Bernardino Mountains. Although it has its own post office, there is no mail delivery. Residents must pick up their own mail.
Perry is in a small town the entire episode. Paul Drake does not appear in this episode; neither does the rest of the regular cast. Della Street makes a very brief appearance when speaking with Perry Mason on the phone.