The shock of the scenes where Lucy displays a disregard for human life might be explained by Lucy just having come through a series of very traumatizing eventsshe's seen her boyfriend and others killed, been through non-consensual abdominal surgery and had a foreign substance in large quantities implanted in her, and been held captive, beaten and almost raped. Indeed, later in the film (with the car chase excepted) this trope is averted, as she actually incapacitates her adversaries instead of killing them.
And even with the car chase, it seemed as if she was rigging most of the cars and pedestrians so that she would narrowly avoid them.
Except that we see a number of collisions and car flips just in the period as she sped through, without even seeing the chaos that must have piled up immediately after. Clearly several people, perhaps dozens, perhaps more, were either killed or seriously injured by the chaos she caused. The morality of her actions seems to have long since ceased to have concerned her.
If she weren't concerned about the morality of her actions, she could easily have killed off the gangsters when she took the other drug packets. Instead she just left them hanging, without even permanently injuring them (as noted, one of them even comes back for the final battle)
The implication is at the point she interrogates the drug lord she has both lost all morality/empathy for individual humans and also gained a full understanding about her own powers. From that point on she doesn't kill anyone else (intentionally) not because she cares deeply about individual human life (if she did she would have done something to save all the people who were killed by the drug cartel and would have been more cautious when racing through traffic) but because she can't be bothered to deal with people who are so powerless to harm her aside from just pushing them out of her way.
During the car chase, she also makes an offhand comment to Del Rio that "We never really die." If she has come to understand some fundamental connection human consciousness has to the universe, that could explain her lack of concern for the physical body dying.
Lucy's ability to remember her experiences in the womb is foreshadowing of her status as a Time Master .
We never do find out who made the drug, or if they've made any more or what they planned to do with it. Imagine what would happen if the next batch did make it to the street: there would be thousands of Lucys. That many reality warpers might well destroy the world.
Didn't the guy who tried to send it out die in the end?
Yes, but he was only one part of the organization. The Evil Brit would be wise to cut his losses after the major debacle this caused, but drug dealers aren't usually known for restraint and logic.
Even if the drug made it onto the street this would likely not be much of a problem for Lucy in her current state; if other reality-warpers were to show up, the only way they could reasonably be able to cause any harm is if they were somehow able to stay under Lucy's radar (not really possible due to her cosmic awareness) or they would have to take as much of the drug as Lucy did and evolve into a cosmic being.
Why was the drug cartel going to such elaborate means to smuggle a newly invented synthetic drug? No drug dogs should be able to detect it and no agents would know what to look for. It's just a random blue crystalline substance. They should have been able to grind it up into a powder, put it in some pixie sticks, and just waltz right through security.
For that matter, even if it were a known drug, there would still be plenty of people willing to body-pack it through airport security to places like Rome, Berlin, Paris, or wherever they were planning to send Lucy before everything went sideways for a small fee.
Didn't the guard dog start to wander over before she told it "go away" mentally? It apparently smelled something unusual.
Considering how common bilingual Chinese-English signage is throughout everywhere else in Taipei shown in the film (as it is in real life), it's a bit convenient that there isn't any inside the hospital so the film can show us how intelligent Lucy is getting that she can now read Chinese.
Lucy's transference of her Organic Technology computer's memory to a USB stick seems useful.... Until you realize that a) she is still able to communicate the same information to similar devices as she has shown through Del Rio's phone; and b) USB sticks can be easily lost by basic human error.
Yes, but if you had that USB stick, would you casually throw it in a drawer and forget about it? Or would you treat it as the almost-holy relic that it is? This troper would never let it out of his sight!
The "10% of your brain" thing being wrong aside, even if it were true how would using more of your brain enable you to float and time travel and do half the stuff she does? I can see psychic powers and messing with your body maybe but this movie just goes way overboard with making up stuff she can do.
Why did they even include the 10% explanation, they could have just thrown some alien substances in there or not explain it at all and let the audience come up with their own reasons and it would have worked just fine.
Why was Lucy being held in a place with abusive guards, while the other 3 mules were simply sent onto their flights unharmed?
Maybe because she was the only hot female?
Lucy's change of her own hair in the Taiwan airport is the first of several demonstrations that her powers include being able to alter substances at the molecular (and perhaps atomic and subatomic) level at will. Why, then, does she need to get the other stashes of the drug? She could just convert a bowl of sugar or something and she'd be OK.
Morgan Freeman's character mentioned that control over one's own body is the first thing learned as brain usage goes up, and control over all matter comes much later. Doesn't make a lot of sense scientifically, but at least the movie was coherent under this aspect.
The first person to try a sample of the drug goes into a fit of laughter. When Lucy gets her doses, she starts floating around the room, falls unconscious, and has ALL SENSE OF HUMOR (and emotions for that matter) REMOVED.
Lucy had a much larger dose.
That's not how it works. If you got a large doze of a drug opposed to a small one, you have feel MORE of the symptoms and side effects, not less.
The other guy was obviously already a junkie. It probably affected him differently because of that.
Perhaps it has less to do with HOW MUCH she got, but rather HOW she got it. The first person INHALED the substance. The body would then need to go through the process of absorbing the substance into the blood stream and distributing it throughout the body. Lucy, however, got the drug put DIRECTLY into the bloodstream, meaning that it would move throughout the body FASTER. The first person didn't get enough time for the effects to be displayed.
...Or maybe he just remembered a very funny childhood joke!
Or perhaps years of drug abuse had already damaged his brain, and all the CPH4 did was repair enough of said damage for him to appreciate the irony of one drug undoing what all the other drugs caused.