Percy Rodriguez who played Commodore Stone in the episode was mistakenly credited as Portmaster Stone at the end.
Captain Kirk's narration
voice-over as he goes to find Ben Finney would reappear in
"The Mark
of Gideon".
Captain Kirk's line of
"But that's not the way it happened!" after seeing the computer
record of the ion storm would later be parodied in "Cannibal! The
Musical", written by and starring Trey Parker and Matt Stone, the
creators of "South Park". (see Behind the Scenes page for
"Dagger of
the Mind" also)