I must have been too young for it to really register that there was a different actor playing Captain Marvel at the time, but I think that kids who were older than I was must have been surprised to see a new guy in the role, especially when Jackson Bostwick was back the following week. But that wasn’t to last; Bostwick was let go after filming two episodes, which were aired first and third this season.
For what it’s worth, Filmation immediately put the word out that Bostwick had been holding out for more money, and that John Davey was rushed onto location the same afternoon in July 1975 that he accepted the part. Bostwick countered that he had obtained a mild injury doing a stunt and was actually seeing a doctor when he was expected on location. The Screen Actors Guild later agreed with Bostwick, and Filmation had to pay him for the five episodes (of seven) that they didn’t use him.
The biggest name among the guest stars in this episode is Wallace Earl Laven, who is in two scenes as a mother who, sensibly, doesn’t want her teenage daughter hanging out with some punk who ends up arrested at the end. She had been acting since the 1940s and continued to appear in small TV roles for the next decade. Of principal interest to me, however, is the appearance of an original “mission”-style Taco Bell building, with tacos, tostadas, and bellburgers on the menu. If you don’t blink, you can also spot a big Kentucky Fried Chicken “bucket” sign on the stretch of businesses where they filmed this.