Trivia: Stan Buffo, named as one of the suspects in the opening, didn't appear in the reveal.
Drew (to the culprit): So it was you?
Inspector Queen (to Ellery): At least you finished your book. All I did was find trout smarter than I am.
Inspector Queen: In my book, revenge is still spelled with a capital "R".
Marvin: I know exactly what I was doing five years ago.
Marvin: Seven years.
Alyssa: Have you ever worked in clay?
Ellery: No, my medium is paper and typewriter ribbons.
Ellery: So you think Buck did it too?
Alyssa: Doesn't everyone?
Childs: I take it that's a threat.
Buck: You take it anyway you want to.
Ellery: Let's go, dad.
Inspector Queen: Let's go! It's almost Inner Sanctum time! Don't you ever get inspired while the sun is shining?
Inspector Queen: Every time I turn around in this case I step over Buck Nolan.
Inspector Queen: Velie, put the cuffs on 'em.
Velie: Which one?
Inspector Queen: Both of 'em.
Mel Ferrer and Dana Wynter, who portray husband and wife in this episode, had previously appeared together playing the romantic leads in the 1959 film Fraulein.
Gary Burghoff makes a rare non-M*A*S*H appearance in this episode playing a character who's quite different from Burghoff's boyish M*A*S*H personna of Corporal Radar O'Reilly.