Natalie Trundy makes her first of two appearances here on Perry as Sandra Keller. Natalie Trundy was one of only two actors (Roddy McDowell being the other) who appeared in 4 of the 5 Planet of the Apes films. Ms. Trundy played both an ape and a human in the films, which her husband A. P. Jacobs produced. Submitted by PaulDrake 33, 29 September 2009.
+ In May 1963(just 2 months after this broadcast), Natalie Trundy was struck by a car and had a serious back injury. She had to wear a back brace for 1 year, which affected her acting career. (Sources- Wikipedia, Submitted by Bob61571, 5 December 2017.

This is likewise the first of two (rather closely spaced) episodes for Arthur Hunnicutt. Coincidently - or perhaps not, given the type of character he played - in his sole Twilight Zone appearance, he also co-starred with a dog. Submitted by Notcom, 022416.

Uncredited Actors: Don Anderson does double duty again in this episode. He’s a spectator early in Sandra’s hearing, and then he plays the bailiff who holds the leash of the dog Hardtack near the end of the hearing. Submitted by FredK, 3 Nov 2010.
+ His appearance as the bailiff holding Hardtack is actually during the murder trial. The bailiff at the hearing about poor Hardtack the dog is Rudolph "Rudy" Salinger, also known as Distinguished Gentleman #1 as mentioned below. HamBurger 7/23/2016

Character Names: For completeness, Arthur Hunnicutt’s character should have been listed as Amos Kenesaw Mountain Keller. Additionally, in the first scene, Thornton addresses the Earth Mover Operator as Brian or Bryant. Lastly, the Coroner’s Physician played by Michael Fox is likely the same Dr. Hoxie that has testified in earlier episodes. Submitted by g, 1/29/2011.

Sightings: Some of our favorite frequent faces break out in some very different roles today. Our “Miss Carmody” has a new job as banker Osgood’s secretary; we catch glimpses of her as Grimsby and later Thornton enter the office. (It is unclear whether the voiceover on the intercom is the same actress.) During the hearing about poor Hardtack the dog, Rudolph "Rudy" Salinger, a.k.a. Distinguished Gentleman #1, who has played an elevator operator, restaurateur, and morgue attendant, is now, for the first time, a bailiff instead of a spectator in the courtroom. But then at Sandra’s hearing, he’s back in the gallery, along with Quiet Old Man #1 and Little Old Lady #1. Submitted by g, 1/29/2011.

Vic Perrin did many voiceovers for and appeared once on the original Star Trek TV series. Submitted by g, 1/29/2011.
+ Mr. Perrin was The Control Voice ["There is nothing wrong with your television set..."] on The Outer Limits television show. It originally ran on ABC for 49 episodes from September 1963 to January 1965. It is available on DVD. Submitted by H. Mason 1/22/15
++VP played the dovish planet leader in "Mirror, Mirror" (TOS 10.6.67 airdate); he may have had a Voiced part in the "Arena" episode of 1.19.67. Mike Bedard 5.29.16.
+++Vic Perrin was also credited in the 1967 Star Trek episode 'The Changeling' as the voice of Nomad. Third_Generation_Fan 1/15/2021
++++ he was also a prolific cast member in dozens of shows toward the end of radio’s golden age. Submitted by Wick 1/27/2022.

For Amos Keller to have been a veteran of the Spanish-American War (a.k.a. the War of 1898), he would have had to have been 80 or 90 years old. The actor Arthur Hunnicutt was only in his fifties at the time. Submitted by g, 1/29/2011.
+ It gets worse. If his father served in the American Civil War and was active in 1864, he could well have been in his thirties at the turn of the century. Submitted by pauloh1 21/11/14
+ Actually, in year 2014 there are around 35 children of Civil War Veterans still alive in America according to groups that monitor these things. This despite the conflict being over for 150 years. Submitted by PaulDrake33, 21 November 2014.

CARS. The new 1963 black-plates show up for the first time on some of the background cars in this episode (California completely replaced its vehicle licence plates in 1963, see here):

Background Cars in or near the parking lot at "Las Dugas & Sunset", 28:47 to 31:07. Paul, Perry & Sandra go there to meet Jim. Cars are all parked with noses facing away from the camera:

It's reasonable to conclude that this episode was filmed in early January 1963 during a transition period in which the old 1956 yellow-plates and the new 1963 black-plates were both valid. This timing is consistent with filming taking place following Raymond Burr's December 1962 hospitalization and six to nine weeks prior to the Original Airdate. Added by Gary Woloski, 9/12/13.

Perry's client on the stand: For the third time we saw Mr. Mason allow his client to testify in court. This time it was a dog bite case. The other two times were in episodes 150 and 162. Submitted by H. Mason 1/22/15
+ Perry's client also testified in episode #38, TCOT Terrified Typist. Submitted by PaulDrake 33. 22 January 2015.

Office decor: At about 40 minutes in on the DVD, the spice jar that is ever-present on Perry's credenza goes missing. JohnK, 11 January 2018
+ Oh, no! Somebody stole the urn again! Submitted by catyron, May 7th, 2018

This is the only PM appearance for Erin O'Brien, who was born in Los Angeles in 1934...MikeM. 11/29/2016 + Erin O'Brien passed away May 20, 2021. Her obit on said this appearance was her last "TV acting role" although IMBD shows an appearance in 1964 on The Danny Kaye Show (perhaps she wasn't 'acting' on that one?). Respectfully, DellaFan2 6/9/2021

This is the only PM appearance for Mary Munday, who was a native of the LA suburb of Glendale...MikeM. 3/7/2017

This is the third of three PM appearances for "Judge Gray" Nolan Leary. Nolan Leary was also on the bench in his first PM appearance, but as "Judge Harry Meeham". Nolan Leary passed in Los Angeles in 1987 at the age of 98...MikeM. 3/27/2018

TCOT Curious Coffee Set: At 38:16 Della pours from the metallic carafe into one of the Curious Coffee Cups. Submitted by catyron, May 7th, 2018

The Dogs: Hardtack is an uncredited Labrador Retriever mix dog. The uncredited background dogs include a black and tan short-haired Dachshund, a small Wire Haired Fox Terrier / Sheltie cross, a large Standard Poodle / Airedale cross, a pale Corgi, a Smooth Fox Terrier, a Beagle, a cream Labrador Retriever, and a large fluffy Chow Chow or Chow / Standard Poodle mix. Submitted by catyron, May 7th, 2018
+ Hardtack definitely is at least half German Shepherd. Submitted by HamBurger, Jul. 20, 2019