Morgan Paull strongly resembles and sounds like Harrison Ford, and some might think he is Ford in the opening. There's a reason for that.
When asked about his mother in the first scene, Leon replies "I'll tell you about my mother!" before pulling out a pistol and shooting the interrogator. He's a son of a gun.
In his first scene, Tyrell declines to take the VK test — partly to see if Rachel will pass it, but also because in earlier versions of the script he is a replicant himself.
Or possibly Tyrell is aware of his own selfishness and lack of empathy and suspects he'd fail the test even if he isn't a replicant.
For quite some time, the contrast between Zhora and Pris has intrigued and bothered me, specifically the way they seemed to exchange roles: Pris started as a "basic pleasure model" and develops into a combatant of sorts with her Ty Lee flips and Xenia Onatopp moves, while Zhora started as an assassin and became a stripper who barely puts up a fight against Deckard before fleeing. Except their divergent reactions to combat situations make perfect sense with their initial programming - Zhora was designed for political hits and stealth, so she'd not only be useless in a fair fight (especially against someone like Deckard), but know it. Pris, meanwhile, would have no experience accurately assessing the threat levels of other people, so she'd just overconfidently assume (much like Leon) that her advanced replicant capabilities would be more than enough advantage.
Zhora working as an exotic dancer makes pretty good sense if you consider that as a combat model, she might be designed with physical strength and agility in mind. There are no shortage of people who would mind seeing a very physically fit and coordinated woman perform nude. Combine this with a strip club being an easier place to get employment than anywhere she could directly employ her designed skillset as originally intended.
When J.F. Sebastian is introduced to Roy Batty and finds out that Roy and Pris are Nexus 6 models, Sebastian proudly says, "There's some of me in you!" Just in time for a cuckoo clock to go off...
Whether intentionally or not, Rachael was given a very Meaningful Name, coming from the Hebrew word for "ewe", or a female sheep. Like so many other replicants, she has as little control over her fate as a livestock animal would.
Gaff's addressing Deckard with the CitySpeak term for "Horse Dick" (see Bilingual Bonus) could rate as Foreshadowing. What's a unicorn? A horse with a phallic symbol on its forehead.
The whole Deckard and Rachel ship. Yes, it's creepy. Yes, it's emotionally stilted. But factor in that she's a Replicant with little to no lived experience, likely programmed for obedience. And then there's...well, he's either a skinjob himself or a deeply messed up human - either way, not really capable of a functioning relationship. Then the sequel implies that the whole "romance" may have been completely arranged by Tyrell from the get-go.
Deckard is somewhat notoriously a Defective Detective and mostly survives, let alone succeeds in his mission, through luck and the actions of others a trait which follows him right to the end of the sequel. Similarly, Holden gets shot by a Replicant multiple times before he has a chance to drop his cigarette. These Blade Runners seem to be rather outmatched in any confrontation with the Replicants, so just what makes them so special? It's not that they're good at fighting Replicants, just that they're specialized in finding Replicants. Once you've got one cornered, presumably any LAPD beat cop with a pistol (or preferably a group of them) can take a Replicant down, it's just that they're usually Hidden in Plain Sight and require special techniques to track down.
How does the Voight-Kampff test actually work? I've seen numerous articles and blog-posts deriding it as stupid and pointless, since it measures reactions yet most people who knew what the test is for would get stressed out anyway, since failing it could mean arrest and execution (sorry, 'retirement'). But I finally figured it out. The Voight-Kampff test isn't just measuring PHYSICAL reactions, it's measuring VERBAL reactions. Look at it this way, if you asked a computer what 2 plus 2 is, it'd tell you it's 4. If you asked a human what 2 plus 2 is, they'd probably say 4 as well. But if you asked a computer something complicated, bizarre, emotional and subjective, like that old chestnut about walking through a desert and finding a turtle, a computer would get confused. A computer would question the question, rather than simply answering, while a human, despite maybe some nervous laughter or confusion, would still attempt to answer the question. A computer, or in this case, a Replicant, would seek clarity and explanations. Leon demands to know what desert he's in, what a turtle is, etc... because he needs the information before he can answer. A human, as said, would still attempt to answer anyway, just with a casual shrug of 'I suppose it'd be this'. But a computer would INSIST on understanding the full story before it could give an explanation. THIS is how the Voight-Kampff test works, not by checking your answer, but by checking HOW you answer.
When Tyrell and Roy are discussing the methods to try and extend Roy's life, Tyrell cites reason after reason why the proposals wouldn't work. And the way he says them, it's obvious he's talking about things he witnessed. So, just how many Replicants did Tyrell burn through trying to figure out ways to extend their lives beyond the mandated "expiration date" before he concluded that it wasn't possible? And were they aware of and voluntarily facing the risks?
Extra horror: he could program them to want to volunteer.
At least one of the methods Roy suggests is dismissed by Tyrell as not working on mature Replicants. His company probably could build them to last longer if he wanted to. In which case he was not actually trying to extend the lifespan, but to make sure the limitation cannot be broken by anything they could think of.
Which fits with the versions of the film with the 'happy ending'.
Perhaps Deckard is not the first person to fall in love with a replicant. Perhaps they wanted to try to extend their loved ones lifespans by any means...now imagine them watching their loved one dying because they tampered with the built in genetic time bomb...
The sequel jumps all over this idea, with the Nexus-7s onwards explicitly not having as limited lifespans, suggesting Tyrell or someone in his employ was successful since Rachel is one of, if not the first Nexus 7 model.
Pris is impressively strong and agile, overall on par with Zhora going by their given stats. It makes sense for a combat model to be very strong and rugged, but when you begin to consider why a sex worker would need to easily handle extreme abuse (such as partial immersion in boiling water), and you begin to realize the sort of things a Replicant sex worker might be expected to endure and still have a four year lifespan. Never mind the consideration of soldiers, laborers, and sex workers who never get past the age of four.