Sightings: Turning up in the courtroom gallery to watch Perry pull a rabbit out of this hat are Quiet Old Man #1 and our “Miss Carmody.” More about them here. Submitted by gracenote, 6/15/2011.

Continuity Error: Note the lighting when the lamp is turned on in the first scene. The lighting in the blackmail photo (supposed taken at that moment) is completely different. Submitted by cgraul, 1/25/2012.

Weren't the blackmail photos taken before Warren turned on the lamp? ("The infrared bulb must have been out of sync with the shutter" for 1 of the 3 photos.) That's when his and Laura's embrace matches the photo that we see. Still, a remarkably good photo considering the circumstances. Submitted by (lowercase, with a comma and period) masonite, 10/29/13.

Although the titles of the episodes are usually centered, in this episode "Positive" is aligned to the left while "Negative" is aligned to the right. Submitted by Wiseguy70005, 6/27/12.
+ Sharp eyes! Submitted by catyron, August 17th, 2018

The widely seen character actor Dabbs Greer made his last of 8 appearances on Perry Mason as Bill Cotton. Submitted by Perry Baby 2/4/14
+ Simon Scott, born Daniel Scott Simon, made the last of his 5 Perry appearances in this episode. Mike Bedard 3.14.15.
This is the only PM writing credit for Robert Yale Libott, who was a graduate of Stanford and of UCLA Law. Libott balanced a legal career in patents and entertainment law with a writing career in radio, television and films...MikeM. 4/17/2018

Emory's Menorah Mailbox: Mr. Emory lives in the same fancy house with the diamond-panelled door we have seen before, and it opens, as usual, to "the" staircase and foyer, as always. But this time is different from all other times -- because on the outer wall of the house is an attached mailbox, with the word EMORY painted on it in white paint -- and it is the same "Jewish Mailbox" previously seen in Episode 265 (TCOT Fanciful Frail). You remember the mailbox -- it's the one with the rampant lions of Judea flanking a Jewish synagogue menorah (candelabrum) surmounted by a royal crown. This menorah-within-a-menorah design is a common feature of Jewish Hanukkah (Chanukah) menorahs. See here and here and here and here. Either Mr. Emory is Jewish or some set decorator is having a lot of fun with this prop. Submitted by catyron, August 18th, 2018

Friday Night Boxing:On the brick wall outside the San Carlos Camera Shop, with its bouncy modern lettering, is an old-fashioned boxing poster. Here is what i can make out -- with word in {brackets} open to question:
{Frank} SLAUSON vs {Johnny} RANSOM
{Les} SHARP vs {Killer} HAND
{?} vs {?}
{?} vs. Buddy FIVE
Zahler WHITE vs. Killer HAND
Submitted by catyron, August 17th, 2018

TCOT West Bend Thermo-Serv: The West Bend Thermo-serv carafe and one cup can be seen on a side table at the Brandons' house when Perry talks to Laura Brandon. Submitted by catyron, August 17th, 2018