After Mannix discovers the body of a murder victim and is knocked into the mud by Sheriff Hale (John Milford), the amount and placement of mud on his clothes changes from shot to shot through the rest of the episode. For example, when he arrives at the doctor's office, there are only a couple of splashes of mud on the rear of his pants. Then when he arrives at the Pineville Lodge, almost the entire upper portion of the back of his pants is muddy. But when he later turns to leave the lodge, there is almost no mud on the back of his pants.
When Mannix is talking to Bill Chase over the radio about the earlier "MAYDAY," he is shown operating a Collins S-Line transmitter, but the closeup shows a Hallicrafters SR-160 transceiver.
Obvious dummy when the body falls from the lookout tower.
The coroner's wagon pulled up and stopped 20 to 30 feet away from the deceased, much farther than it should have, especially since there was room for it to park closer. It seemed the sole purpose of the wagon stopping where it did was to block Bill Chase's car.
When Mannix first arrives at Bill Chase's house Laura Giles tells him that road to the lookout is dangerous so she recommends he take the red Jeep Commando. Later we find out that Laura drove her Triumph Spitfire to the lookout. Additionally Mannix drives Dr. Harris' Dodge Dart to the lookout. The drive to the lookout was only dangerous when Mannix drove the Jeep.
Whoever robbed the jewelry store and killed the jeweler wasn't wearing gloves and picked up the tray holding the gems, so the killer should be identifiable from fingerprints.
Hal K. Dawson's character, the jeweler, is mistakenly called "Kessler" in the end credits despite the fact that both Mannix and Police Officer Carlos call him "Kester" and the fact that his name appears in bold letters as "Aaron Kester" on the door to his business at the beginning of the episode.