Trivia: In the close-up of the diary of Julie Matlock, you can read in the column to the right of the page with the mysterious number 19871 a name; Agnes Dahan. It's the name of the production buyer of the episode, and long time staff member of the show in production and art department. (00:20:20)
Trivia: A few lines of dialogue are cut from stream releases; in the interview with Samuel Palmer after they find out about the past, the detectives ask; "And you took the rap for him?" Samuel says "When the police asked me if anyone else was involved, I said no.", to which Florence replies "You served five years. That's quite a favour.", with Samuel saying "He was my friend. He would've done the same thing for me." This part contained a mistake, since it was established earlier that he served 4 years, not five (rap sheet that Florence read to Humphrey and was on camera in close-up), that might be the reason.
Trivia: A bit of the episode has been cut for the streaming releases; at the end of the scene with Humphrey taking Martha's luggage, he would make a date with her for the next day, to cook dinner for her at 8. This has been eliminated probably because it created timing issues with 8 PM being too well lit (in contrast with the supposed timing of the murder) and the ending takes place at Catherine's for a cute drinking scene anyway. (00:22:50)