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[[folder: Fridge Brilliance ]]

* During its original run and well into syndication, I couldn't stand ''QuantumLeap'' -- the "rules" governing Sam's time travel made no ''sense'' to me. "He's bouncing around from time period to time period, and he's stuck in each life until he makes things... ''nice??''" One weekend, the SciFiChannel ran a marathon of the final episodes of various shows, and I happened to catch the finale of ''QL'', which reveals that the controlling impulse behind Sam's "leaping" is [[spoiler: his own subconscious drive to make the world a better place, one life at a time]] -- and I then proceeded to catch the show five days a week for the next few months. -- Tropers/YourObedientSerpent
** The other thing that I realized (then Googled and realized to my disappointment I wasn't the first) was that, especially clear during the last season, he was realigning the "Ziggy Version" of history to match our version and that after those "major" events in modern history were lined up, he was done except for one last thing (having Beth wait for Al) which completed the alignment and therefore returned to his "Ziggy History" timeline and disappeared from our timeline (thus ending the series) -- Tropers/GaidinBDJ
* In "Star Light, Star Bright," Sam is hypnotized, and on tape, gives away the secret access code name and numbers regarding top secret information about Project Quantum Leap. An episode later, we meet an evil leaper and hologram. Clearly, someone else found the tape, accessed PQL's files, and set up their own project for personal gain!
** Mind. Blown.
** And thanks to the events of "Shock Theater" and "The Leap Back," one of the Project's handlinks is left stranded in the 1940s and unaccounted for. It won't work for another 50 years, but it's completely intact and undamaged. Between that tape and a piece of technology that could be reverse-engineered...
** That explains why the evil leaper organization does everything exactly the same with different sound effects; hologram technology, handlink, etc. Plus, Zoe was aware of just how long the window was before a successful retrieval could be performed, which means the evil organization may have improved on PQL's math.

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[[folder: Fridge Horror ]]

* Occasionally, history changes to avoid a disastrous marriage. This was even the point of at least two episodes. The problem? Some of the marriages resulted in children but now, those children will never have a chance to live. Sam and Al are essentially murderers and never show any remorse about it. In one episode Al even gleefully proclaims something along the lines of "Now she won't end up having a couple of screwballs!" Suddenly, Sam and Al ''don't'' seem like such [[NiceGuy nice guys.]]
** It's not murder if you prevent someone from existing but, yes, that is pretty horrifying. There are presumably new kids who exist who live better and happier lives than the old timeline's but saying that the happiness of the parents is worth more than the ''existence'' of the children...It's a problem.
** I always thought of it like The Inquisitor from Series/RedDwarf. Instead of children being born who would do nothing with their lives, we get children who never had a chance to exist being born, children who might contribute something to society. And considering that Ziggy never reported that their children did anything (as the OP pointed out, they were a couple of screwballs), then we must assume that this was the case in the other occasions when Sam broke up a marriage.