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."
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.