This episode came out 18 days after Bitter Pill (1982), which revolved around a similar premise; a man selling legal speed pills that ultimately killed a couple of teenagers.
When Herb went into the production room and left Johnny and Mr. Wickerman in the control room, Herb addressed them via a live microphone. In order to hear Herb over the mic, the channel would have to be already in the cue mode on the control room board. Herb was not to know this. Herb would also have to turn the mic on in the production room, but he never accessed the production room board before speaking into the mic.