Shots at the beginning of the story, of the Screaming Mimi cutting out and falling out of the sky, are recycled from the pilot episode.
Someone's got ask it: Why is the episode called, "Four-Eyes," when there are a total of FIVE of them? Even Quinlin suggests "The Five Private Eyes" as a name for them.
German Title: Der tote Auftraggeber
To the uninitiated viewer, Myron Bell may seem to be a re-occurring character, but although he's introduced as if we've seen him before in the series, this is in fact his first appearance. (He does, however, make another appearance, in the late episode 'If You Can't Beat 'Em, Join 'Em')