The Case of the Wandering Widow - S4-E6
Continuity mistake: Perry and Paul go to the park at ten o'clock at night but the sun is shining and casting shadows.
Perry Mason (1957)
1 continuity mistake in season 4 - chronological order
Starring: Raymond Burr, Barbara Hale, Ray Collins, William Hopper
The Case of the Lucky Loser - S2-E2
Visible crew/equipment: After leaving her husband at train station, Harriet takes a cab to meet a man at a cabin. After a few mins, she takes the man's car to go home. As she drives away, there's a reflection of a man, in suit with glasses (possibly the director) standing offscreen. (00:05:20)
Hamilton Burger: Incompetent, irrelevant, and immaterial.