Louise Sorel worked again with William Shatner on the Star Trek episode "Requiem for Methuselah"
This was the first time that Louise Sorel played William Shatner's love interest. She would later do so again in Requiem for Methuselah (1969).
Glenn Corbett worked with Wiilam Shatner again in the Star Trek (TOS) episode "Metamorphosis".
The Corvette has 1964 Corvette hubcaps on it again, after having Daytona wire wheels on it in Where Are the Sounds of Celli Brahms? (1963). While this doesn't make sense to which, it is because this one is filmed in Maine, just like Come Out, Come Out, Wherever You Are! (1963) was filmed in Maine with hubcaps, and Where Are the Sounds of Celli Brahms? (1963) was filmed in Minnesota with wire wheels, so they are not being shown in the order they were filmed.