Patzer

During the prologue, a pair of leather gloves seemingly teleport from Jasper Fenton's back pocket to his hands and again to his back pocket.

When Perry Mason is cross-examining "Chi-Chi", the judge asks the court reporter to read back Perry's question. The shot before this shows a water cooler and file cabinet behind the court reporter. The closeup shot of the court reporter shows the water cooler, but the file cabinet is blocked by a guard who is standing in front of it. He was not in the earlier shot.

In Mason's cross-examination of Irene Kilby, she initially has a beauty mark about an inch below the left corner of her mouth. Later, during her testimony, the beauty mark is gone.

(at around 31 mins) Lois Fenton has a beauty mark near the left corner of her mouth in her scene with Perry in the record shop. Her beauty mark remains there through her trial. In her last scene, the beauty mark has moved to right corner of her mouth.

The knife sticking out of John Callender's back is obviously stuck in a block of wood or something. Very nearly the full length of blade is showing. The amount of blade that appears to be in the victim would not be enough to break the skin, much less kill a person.

The hotel clerk notices a hair on the pillow and the feather but doesn't say anything about the blood all over the feather or the big blood stain on the floor. Even after, she says she can just straighten the bed and re-rent the room.

After discovering a body, Paul Drake convinces Perry to call homicide. Perry calls Madison 5-1190 and speaks to homicide. That is Perry Mason's office number, not the number of Lt. Tragg at homicide.