Don't Forget the Diver - S4-E2
Factual error: While Capt. Square is looking through his binoculars at what he thinks is Mainwaring's platoon marching with their rifles, a 1960's Bedford lorry drives past on the road behind them.
A Thousand Pardons -- You're Dead! - S2-E1
Factual error: Danno, who's posing as a Marine, has hair that's far too long to be permitted in the Corps. In fact, all of the Marines in this episode have non-regulation (too long) haircuts. 'T'was the same then as it is now: US Marines are given "buzz jobs," and hair longer than an inch is not allowed.
A Sour Note - S2-E2
Factual error: Gino commits a murder using a six-shooter with a silencer attached, and his shot doesn't make any noise. But it should have. Though it's a long-standing Hollywood cliché, a revolver with a silencer wouldn't be silent at all. Unlike automatic weapons, revolvers are open-chambered, which allows sound to escape. They can't be muffled with a silencer. (00:34:00)
Aunt Bee's Cruise: Part 2 - S1-E16
Factual error: Captain Wolford tells Aunt Bee that he has performed several shipboard weddings. Contrary to popular belief, sea captains have no authority to perform weddings.
Factual error: 19 1/2 minutes in. They pull over a car and run the plate. Malloy tells the driver the car is registered to a Volkswagen. He should have said the plate is registered.
Episode #1.3 - S1-E3
Factual error: In the Scarlet Pimpernel sketch, the opening caption reads "France, 1778." This is the Scarlet Pimpernel who rescues people during the "Reign of Terror", as is confirmed several times during the sketch. But the French Revolution was still eleven years away and its Reign of Terror wouldn't start until 1793.
Factual error: Early in the episode, while Jason is at the log flume, power lines and transformers are visible to the left. (00:01:15)