Factual error: Many of the episodes are set in the 1950's or early 1960's, but we always see three-prong electrical outlets in the buildings. Three prong electrical outlets only came into common use in the mid to late 1960's, and were required starting in 1969. While they existed before that, they were only installed in specific use situations.
Quantum Leap (1989)
1 factual error in show generally - chronological order
Starring: Dean Stockwell, Scott Bakula, Deborah Pratt
How the Tess Was Won - August 5, 1956 - S1-E5
Continuity mistake: Though he's leaped into someone else, we always see Sam as Sam, dressed in all the host's clothes (including glasses or sunglasses). His host is revealed only in reflections. But here, when he looks at his host-self in the mirror, the hat and clothes are all identical - except that the reflection is wearing glasses, and Sam isn't. (00:43:00)
Sam: Leaping about in time, I've found that there are some things in life that I can't change, and there are some things that I can. To save a life, to change a heart, to make the right choice. I guess that's what life's about, making the right choice at the right time.
A Portrait for Troian - February 7, 1971 - S2-E11
Trivia: "Troian" is the name of series creator Donald P. Bellisario and show producer Deborah Pratt's first daughter.
Leaping of the Shrew - September 27, 1956 - S5-E3
Question: Shortly after Sam throws some items off the life raft, Al appears and tells him that because of what Sam had done, neither he nor Vanessa would be saved for quite a while. If Sam had not done anything, both of them would have been rescued within an hour. I might be wrong about this next part so further verification will help. Al also said that because of Sam throwing stuff into the ocean, that somehow, instead if only being stranded in the lifeboat for a few minutes, four whole hours have passed. How could tossing anything into the ocean have made time move so rapidly?
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Answer: Sam threw items off the raft to lighten the load, so it wouldn't sink, in doing so he made the raft less heavy. Which made easier to float with the currents, if it was heavy the raft would have moved slower and not moved so far.
Except that Al said that immediately after throwing stuff out of the boat four hours passed and it was shown that they didn't really move from where they were. They were still in the same spot. Forgot to ask this too. When Sam and Vanessa are stranded on the island, one of them, can't remember who, did something and when Al appears, he tells them that because of it, time had suddenly skipped several more hours and if the event hadn't been interrupted, they would have been rescued by a boat. So, what happened on the island that once again caused time to speed up? It seems kind of strange that time could move so quickly on the island, especially since it was still day time and it never showed any sort of changes like the sun or clouds moving.