Factual error: At the end of episode one, Buzz and Tod leave Mississippi in their 1960 Corvette on their way to meet a friend with a shrimp boat. Amazingly enough, by the time they cross the border to Louisiana, the Corvette has become a 1961, yet retains the same license plate number.
The Swan Bed - S1-E3
Factual error: As the opening credits roll, the boys are crossing a bridge into NOLA, and Buzz tunes the radio into a local station, "WWL, New Orleans, 870 on you AM dial".however, a close up of the 'Vette's radio shows the pointer sitting just to the right of the CONELRAD marker, which was 640 on the dial.
To Walk with the Serpent - S2-E14
Character mistake: Westerbrook's last name is misspelled on his own crusade poster as "Westbrook."
To Walk with the Serpent - S2-E14
Character mistake: Westerbrook deliberately burns his own right hand in the ceremonial flame. But at the end of the episode, he says, "I gave my left hand for the cause."
Continuity mistake: When George Maharis walked out over a salary dispute, his character Buz was said to be in the hospital and was absent for about 10 episodes. (The tiff finally resulted in his removal from the series in the 4th season.) Airing out of production order, however, rendered the bizarre third season phenomenon of a supposedly hospitalized Buz who re-appeared periodically as though he'd never been away, then was "sick" again in the next episode.
Hey, Moth, Come Eat the Flame - S3-E11
Continuity mistake: In this episode, without explanation, Todd is suddenly driving a brand new 1963 Corvette instead of the previous 1961 model. But because the episodes were not aired in production order, the old car reappears six episodes later in "A Gift for a Warrior."
Where Is Chick Lorimer, Where Has She Gone? - S3-E13
Revealing mistake: Tod parks his car across the street, facing left. While standing in front of the house Ellen and Peter run to Peter's vehicle and drive off to the right. Tod goes back across the street and gets back in the Corvette. The image is then flipped to give the illusion that he is driving in the direction Ellen and Peter went. (00:21:00)
Same Picture, Different Frame - S4-E2
Continuity mistake: While Morgan is driving she gets a flat tire, and in the close-up the Cadillac's license plate number is 84-I33, but in the wide shot it's 5G6-420. (00:09:20)
Like This It Means Father... Like This - Bitter... Like This - Tiger... - S4-E15
Continuity mistake: The bruise on Wilcox's cheek switches from the right side of his face to the left and back again several times throughout the episode.