When Perry goes to make a call from the suspect woman's apartment, he lifts the receiver to his face before dialing. Then in the closeup, the receiver is not by his face. He dials and then raises the receiver to his face.
The plane shown in the air is not the same plane shown on the ground. The one on the ground has a painted line down the middle and no other paint. The plane in the air is clearly fully painted in several colors.
Loraine Keely in shower when Perry visits. She goes in bedroom to change and then shortly after Perry hears a car start and goes to the front door and Ms. Keely is driving away with completely dry hair.
About 8 minutes into the show when Perry Mason is checking out an apartment, he looks for contents inside a wall safe. The safe door is already open and it must be a fake safe because as he opens the door you can see that there is no mechanisms on the back of the door and no latch on the side where it would lock the safe securely.
In the Closing Credits, Lisa Gaye is listed as "Laraine Keely." But, on one of her letters' envelopes that Perry takes a peek at, the letter is addressed to "Miss Laraine Keeley," the last name containing three "e's" instead of two.
When Perry and Paul are in apartment 9C, Perry finds a wall safe with the door ajar and opens it along the top edge using a handkerchief to avoid leaving fingerprints. But after finding nothing in the safe, he wipes the side edge of the door clean with his handkerchief as he closes it, thus removing any fingerprints that might have been there.
When Perry and Paul are in apartment 9C, Paul sees a picture of a woman in a bathing suit and picks it up barehanded by the side of the frame. After he and Perry decide their presence there may be a set-up, he picks up the picture again by the top of the frame using a handkerchief to avoid leaving fingerprints. But he does nothing to wipe away the prints he had already left on the side of the frame.
After the judge declares a 48-hour continuance of the hearing, he calls a "short recess." But because he granted a continuance, the proper course would be to adjourn the hearing instead of merely calling a recess.