* How did Peter hide in plain sight from the Gunslinger robot, when it had heat vision? Also, the robots must have very advanced cooling systems for them to be cold.
** A case of ScienceMarchesOn - most writers of the time figured robots would be "room temperature", not realizing that a lot of transistors would give off a lot of heat (less than a similar number of vacuum tubes, but still).
*** So then again, shouldn't sexbots be warm to the touch?
*** Possibly the ''distribution'' of heat within a robot's body is different enough for the sensors to tell the difference, and saying the weapon sensors key in on "cold" is shorthand for "cold in different areas". We never actually see the Gunslinger view an active fellow-robot with thermographic vision, so have no way of knowing what a functional robot's heat-image looks like.
** The impression I got was that the Gunslinger had the infra-red vision as a backup and only started using it when [[spoiler:its "real" vision was damaged by the chemicals thrown in its face]] (it isn't shown using it before that point, and is only shown using it afterwards). The heat vision was probably designed to detect the warmest things around (i.e. the guests) and ignore everything else, so [[spoiler:the torches in that room were significantly warmer than Peter, allowing him to remain undetected]].
** The scene in which they gave the robot infrared vision suggests it was nothing more than a routine upgrade, intended to make him a bit more challenging (being able to find a guest faster) as a designated adversary. Of course, when the robots went berserk, this turned out to be a feature GoneHorriblyRight as he proved very challenging indeed. Incidentally, one can see him using the vision before he got burned with acid in order to track Peter's footsteps, so presumably it ''was'' intended to be used at all times.
*** Alternately, the thermographic sight could've never been intended for use during a scenario at all - if a storyline requires the Gunslinger to track down a guest, the park's staff who monitor events via CCTV can just radio in and ''tell'' the robot where its next scene should be - but rather, to facilitate cleanup after an encounter has played out. Guest and Gunslinger play out gunfight at saloon, Gunslinger goes down, guest gets drunk celebrating and passes out on the floor, set lights go dark so guest can sleep it off, "dead" Gunslinger gets up and walks out under cover of darkness ''without'' stepping on visibly-hot guest.
* Why does the park use real guns? They could have just put squibs in the robots or something, would have been a lot safer.
** As part of the attraction to the theme parks, the guns are real to heighten the thrill of shooting someone, even if it's an artificial someone.
** There's also a real reason to that. The guns use thermal sensors, hence why when John asked Peter to shoot him, it didn't work (what John exactly said, I forgot, but it had something to do with body temperature). Maybe when the park's control system went out of whack, the thermal sensors started being indiscriminate towards human and robot-kind.
** Using real guns also allows guests to take potshots at props, like bottles or whatever, without having to rig ''every'' inanimate object in Westworld with embedded blasting caps.
* What about the swords? The guns can't harm humans but what's to stop a visitor from accidentally stabbing a guest with a sword?
** It's not much of a defence, but you ''can't'' exclude swords from [[TheThemeparkVersion Themepark]] [[TheMiddleAges Middle Ages]]. The vacations were 100% about the experience, and the experience in Medieval World would be inauthentic without them.
** Considering the lack of security, the technicians probably considered the danger of one guest "accidentally" stabbing another with a sword in Medieval World to be as likely as a guest "accidentally" bludgeoning another with a liquor bottle in Western World. Any object is potentially dangerous in the hands of a human being, but the main concern of the technicians was making sure they weren't potentially dangerous in the hands of a ''robot''.
** The swords could potentially have been very blunt as well, similar to the swords reenactors use, you can swing them with a lot of force and do only minor damage, therefore only the robots could be set to react to them.
** Remember the bar fight where everything in the room suddenly started breaking as if it were made of foam. Considering how easily the chairs break, they could never have supported a person's weight. The obvious answer is that nothing in the room is merely what it appears to be. Instead of solid wood, the chairs must have had a mechanism that made them solid when they need to be solid, and soft when they need to be soft. Something similar must apply to the swords to give them the same safety as the guns. Delos would never have knowingly put guests at risk by giving people truly dangerous weapons.
* The fact the robots are not waterproof or at least able to consume liquids. It seems the moment a tourist tried to share a drink with one of the robots it would immediately short circuit. This is more glaring when the viewer would have already seen some of the machines drinking. Does this indicate some had the ability whereas others didn't? Why would you make them acid resistant but not able to swim without breaking?
** Perhaps the girl in the dungeon is damaged in some way. The brothel madam in Westworld is seen drinking and smoking.
** For one thing, they weren't especially acid-resistant; the Gunslinger was looking very blistered indeed after he got splashed. There just wasn't that much actually thrown on him, and whichever acid Peter used, the acids shown being available to him were all "strong" acids, meaning they would not burn much beyond where they hit before the reaction was complete. ("Weak" acids can actually be more dangerous in this regard, as their reactions are ''never'' entirely complete.)
** As for the drinking and waterproofing, this might well vary from one robot to another as a bit of financial corner-cutting: the capacity for eating and drinking would cost extra, so the technicians would try to have it installed only in robots that needed to do this for social reasons. Robots intended as sex bots (such as that poor girl in the dungeon) or purely for fighting (such as that black knight) wouldn't ever be called upon to eat or drink, and therefore wouldn't normally need these capacities. It's an in-universe case of TheyWastedAPerfectlyGoodSandwich. The Gunslinger, as part of his program, was intended to order a drink and down it as part of picking a fight, so naturally he had these capacities. So would any robots called upon to swim, though it's doubtful there were very many situations of that sort outside of Roman World with its pool parties. Otherwise, it's strictly optional and there's no money in the company's budget for it.
*** At the risk of being crude; but a sex bot surely should be the most waterproof of them all. A sex bot that short circuits after consuming a bit of liquid is a risk to the patron if nothing else.
* How did exactly the Gunslinger plan to kill Martin anyway after his gun ran out of batteries ?
** He's a robot programmed to be a westerner. If he couldn't shoot his target, he would either try to hang him or beat him to death.
* The horses are also robots, but the Gunslinger manages to track Peter on horseback by seeing the horse's footprints in infrared. Oddly, the tracks are only of the horseshoes.
** One word: friction. An animal's bodyheat doesn't stick around long enough to stick to the footprints, anyhow. The friction heat caused by the steps themselves might.
* Who the hell designed that [[NoOshaCompliance control]] [[MalevolentArchitecture room]]?
** Probably the same one who designed Jurassic Park.
* Assuming the, for lack of a better term, daily quests reset each day, where do the guests go while everything is brought back to normal?
** In the film, it's shown that the maintenance work takes place in the middle of the night while the guests are asleep. It's also possible that there aren't daily resets but resets after a group of guests leave and a new group arrives. Alternatively, only a small group of hosts are reset daily while others are reset as needed out of view of any guests.
** Then again, it's shown that the Hosts' interface is through voice and wireless tablets, therefore resets can occur quickly and seamlessly.
** The most of the Narriatives will most likely be made so that they run in a cycle: For Example the towns doctor get's up on the morning, eats breakfast with his family, walks to work, talks with the people, treats patients, goes on a small trip with his family after work and then goes to bed at night. So as he is reset while sleeping, nobody will see his reset.
* Who would bring their kid to Westworld? One wrong turn and you could be watching someone's cannibalism or gang rape fantasy.
** Possibly there are children-only sections of the park that are safe to visit for short durations; we only see the child and his parents for that single scene with Dolores who is doing nothing more than painting. The hosts in close proximity and the human staff (as well as their parents, we hope) would likely keep a close watch on any children and actively keep them away from any inappropriate activity.
** Alternatively, they could be the kind of parents who seem to view the violence of Westworld as no different than what's seen in a violent video game.
*** The show has the parents say "not to cross the river." They say it's because there's inappropriate material there, which implies there's an Adult section of the park and a Family-Friendly section. A guest on the train also says his first visit was a harmless gold-mining trip with his family before going alone a second time and went "pure evil".
* Why are there flies in what is presumably a highly sterile lab?
** One possibility is that the room where the flies are isn't meant to be sterile at all but an area where hosts can be examined and minor repairs and reprogramming made. The manufacturing areas would definitely be sterile; and during that scene in "The Original" there were no flies.
** Alternatively, that there are flies where there shouldn't be and areas of the park that are neglected (such as cold storage) is another way of showing that management is not entirely proactive in upkeep. Besides the failing cooling system mentioned, the fact that the staff knew there was unauthorized activity in cold storage but had no specifics (that Dr. Ford was there, what host was in operation or even any cameras in the area) illustrates how management doesn't have the control they think they have.
** The presence of flies may also act [[FridgeBrilliance as a sort of security system]], like a canary. Hosts are programmed not to harm a living thing, so any host that tries to swat away a fly is either actually a human, or is acting against its coding.
** Or the flies could be wireless security cameras.
** Another possibility is that the lab conditions aren't as sterile as they should be -- like the malfunctioning cooling system in the cold storage area, conditions are beginning to deteriorate as the size of the operation has grown beyond what can be sustained.
*** Or resources that are supposed to be used for such work are being diverted for whatever Management is ultimately up to.
*** Or the flies are a clue that, say, there's a dead body hidden under the lab floor.
*** Possibly averted in if that were the case, there'd be a lot more flies and a horrible smell.
** ''Chestnut'' demonstrates that the Hosts have organic components (with some techs mentioning that Maeve somehow contracted an MRSA infection from one of the guests), and its these organic components that are attracting the flies.
* Why does the intro show a half-made's host's hands playing the piano, but the piano in the series is automatic and has no player?
** Symbolism. The intro has the piano string being laid out by machine, cutting to a host's artificial muscle being laid out to a bone by a similar mechanism, drawing a similarity between the piano and the hosts. The piano starts off being played by the host's hands, but the hands later lift away and it continues playing itself, like the hosts starting off under the control of the humans but later becoming autonomous.
* What is preventing guests from harming another? For example what is to prevent a guest coming across another in the outlying areas, assume the other is a host without questioning first and then attack them with a knife or rape them against protests like we seen the Man in Black do?
** Nothing, but the fact that everything you do is on camera is a '''big''' encouragement to make sure you know before you try. Best case scenario, the guest yells out that they're a guest. Worst case, someone does get raped/killed and criminal charges are filed.
** It's also unclear how the weaponry works, per se. The Host's guns seem to be selectively lethal: Teddy is able to gorily gun down other Hosts, with his bullets tearing gaping holes in his opponent's body structure, but the moment he turns his guns to a Guest, the bullets act as pellets. It's possible the Guests receive guns with the exact same properties (lethal when up against Hosts, harmless when up against humans).
** "The Stray" makes clear that only certain Hosts are allowed to handle dangerous tools. For example from the group of men caught in a loop in that episode, only the one who vanished could handle the axe, thus causing the loop, as the others were able to do it in theory but not in practice.