While you may not notice the first time, Silva's plan depends on repeated failures and blunders by MI6 staff, including:
Plugging a cyberterrorist genius's laptop into their own system.
Having every door in the complex electronically controlled by said system, with no manual overrides.
Having guards who won't sound the alarm or shoot a known-to-be-dangerous prisoner once the doors open unexpectedly and who can be overpowered and killed offscreen by an unarmed man.
While Silva might guess they'd plug his machine in ASAP to find the spy list (thereby opening doors and possibly alerting his minions), he had no way to know the hacking or his incarceration would coincide with M's committee meeting (that's assuming he knows he'll be in MI6 at all, rather than interrogated elsewhere like Mr. White in the previous film).
Then again, he is the sort to take chances, and probably had some sort of contingency in place just in case he happened to escape during the hearing. Maybe he just modified a regular escape plan, when he realized where she'd be.
When Silva blows the cover of the agents, you see one getting shot in the head, but what about the others? Perhaps at least one of them got captured and tortured, and may have even ended up exactly like Silva did.
It's mentioned in the news brief that three out of the five undercover agents have been killed, probably brutally. Silva's trying to rub salt in the wound by forcing M and MI6 to confront publicly fucking over other agents like they fucked him over.
Kind of lapsing into WMG territory, but no one ever explicitly states that Silva was a field agent. We know from Agent Fields in Quantum of Solace that even people in MI6 office jobs can be called "agents". He can fire a gun and lob some grenades, but he's got mooks to do the really hardcore dirty work, and he even says to Bond that he finds "all this running around, it's exhasuting." It's entirely possible that the 11 years he spent at MI6 were entirely spent in front of a computer. If this is the case, then M sent a man with little to no counter-torture training directly into the hands of the Chinese.
In M's defence, Silva got himself into trouble in large part because he was going off rogue all by himself. This interpretation still allows for the fact that he got in way over his head, however, and that M basically left him there knowing full well he wasn't equipped to cope with it.
It's mentioned that Skyfall was sold after Bond's "death". What happens when the new owner arrives and sees the destroyed property, crashed helicoptor, and numerous dead bodies?
It's a shame to rain on the above, but this entry springs from false premises. M says that they "sold [Bond's] flat", implying he had an apartment in London; she wasn't referring to Skyfall.
No, Kincaide mentions that the house and most of the guns were sold off, which is why they have to do the Home Alone thing
The opening song is sung from M's perspective after her death. "You can take my name, but you can never have my heart"
Silva's "accent" is distinctive and elegant, yet hard to pin down, which is somewhat jarring given that he's a British agent. Then, after he's captured, he removes a dental prosthetic that is keeping his cheeks inflated. It's not an accent, it's a lisp.
Or he's a native Castillian Spanish speaker, which has a lisp as part of its accent. A native Spanish speaker who also has the British citizenship and parentage required to be an MI-6 agent? Must be from Gibraltar. Combined with having worked in Hong Kong probably from age 17/18, his mockery of "the Empire" carries so much more weight.
Silva's slightly puffy, slack features also lend him a slightly uncanny appearance — until it becomes clear his facial structures are seriously damaged from the botched cyanide capsule (and related torture). Previously he may have been considerably more standardly good-looking, like 007 himself.
The bartender is the casino without being told shakes Bond's martini. It's in character for Silva, having Bond's profile to plant a bartender who knows how he likes his drinks.
If you think about it a little bit longer, it becomes even more brillant: The bartender was preparing the martini right in front of Bond, and it is implied he even kept Severine waiting to watch the procedure. What happened the last time Bond was in a casino? Bonds drink was poisoned. Clearly, the man learns from his mistakes.
Not necessarily that funny; komodo dragons don't usually eat people but if they've been starved, they'll eat anything. And their bites include 60 incredibly sharp teeth, definite severe infection, and possibly venom, though the last is debated by scientists. With medical treatment the guy could live, but it won't be pleasant for him.
And to make it so M is directly responsible for all the deaths of the agents on that list. Brilliant revenge plan, really! And good foreshadowing.
Also, why did he betray five? M traded Silva to save six other agents, in essence saving five lives in net. By betraying those five agents, M's action ends up being a total wash.
How did Silva know Q would plug his computer into the network in an unsecured manner? It's not like he had access to his psychological profile - oh.
Alternately, it was secured. Just not secure enough.
In the end, Silva dies with a knife to the back which is symbolic considering M's betrayal is what sets this all off in the first place.
Also, 007 uses M as bait to draw out Silva. She spends the last half hour of the movie wearing a shawl to keep warm, and as mentioned, Bond knifes him in the back. Hmm... what's the old English phrase for espionage, secrecy, and intrigue? Cloak & Dagger.
It's beyond that: M betrayed Silva to his death. In the climax, he ends up killed stabbed in the back. Now, what is another word for betrayal?
The end of the movie is essentially an inversion of the classic James Bond scenario of Bond infiltrating / attacking and destroying the villain's hi-tech lair at the end of the movie; this time, it's the Bond villain attacking and destroying Bond's lair, and far from being hi-tech and advanced it's a run down old Scottish manor.
While preparing for the siege at Skyfall manor, Kincaide mentions that Bond's father's hunting rifle tends to drag to the left when fired. This combined with Bond's bum right shoulder cancels the two handicaps out, thus making Bond an excellent shot once more for the final fight.
Much of the dialogue involving Kincade becomes very meta when one recalls they originally wanted to have Sean Connery play him. Case in point, his introductory scene:
Kincade: "James. James Bond!"
Bond: "Good God. You're still alive?"
Kincade's Bond One-Liner after killing that henchman was distracting for how clearly it seemed to be written for Connery:
Silva managing to survive cyanide poisoning could be a reference to how rats can develop resistance to some poisons.
It is explicitly stated that the explosion at MI6 headquarters, done by remotely tampering with various systems including the natural gas lines (not entirely unlike how the narrator's apartment is destroyed in Fight Club), should have been impossible for a variety of reasons. Silva must have had an in on some major work to either build or renovate the headquarters at some point, specifically rigging it so that Everything Is Online, even things that had no reason to be. Easiest way to find the back door to a security system? Install it yourself.
Eve says she's not cut out for fieldwork. Now, considering her action in Istanbul and in the Parliament, that seems weird. But then, early on Istanbul, we see the difference between her and Bond. Whereas Bond is willing to abandon a fellow MI6 officer to death (albeit not without anger and regret), Eve cannot proceed to keep shooting at Patrice after she shot Bond. (Mind you, her rifle is automatic!)
The Arc Words "Sometimes the old ways are best" not only speak to Bond's facing his own troubled past and the continued usefulness of both MI6 and Britain as a whole in the modern world, but also the return of the Bond franchise to the simpler, more hardboiled style of the early Connery films, a choice which has been lauded in both Casino Royale and Skyfall.
The fact that Kincaid, after handily dropping two mooks during the siege of Skyfall, drops a Bond One-Liner. Where do you think Bond himself picked up the habit?
Love the idea, but would that mean that Bond had watched Kincade kill a bunch of people as a child?
Maybe he made those quips after shooting pheasants or something.
Well, that could be a part of why Bond says, "I've always hated this place."
The introductory scene with Q could be seen as an attack at the people who have been criticizing the Craig films for not having Q's sparkly little gadgets that have become tradition with every passing Bond movie before Casino Royale. Beginning with when we find out who Q really is; a young and rather hipstery looking man who doesn't look like he spends much of his time near a piece of technology (and even throws in the obligatory tea reference). And then we find out that the most high-tech gadget in the whole movie is... Bond's gun and a radio. Bond's reaction to this seems to mirror the audience's reaction upon seeing the scene in the trailer: "It's not exactly Christmas, is it?!", to which Q correctly points out that the audience has gotten too used to the rather generic action movie feel that the series has taken on since You Only Live Twice: "Well, what do you expect, an exploding pen?". Essentially, the writers are telling the audience, "You didn't like the gadget-filled Die Another Day, yet you're begging for Q and the gadgets. Here you go, here's your stupid quartermaster." And hilariously enough, when the audience sees just how cleverly both gadgets are used, they realize Bond really is a high-tech gadget in and of himself, realizing just how far Bond managed to go in the previous two films.
In addition, people have pointed out that the radio Bond receives is much larger than the one he uses in Goldfinger. This could also be seen as an attack on people who want the "good old days" of Sean Connery all over again.
When escaping from the now-burning manor, Kincade and M go to the chapel and Silva spots their flashlight beam. It seems like a straight case of Idiot Ball that M would make such an amateurish mistake, except that, when you think about it, it's not really a mistake. She was wounded and the moor's terrain was too rough to go over without using the light (Silva only makes it because he's following them). They really didn't have an option.
When Bond and Q first meet, they discuss a painting of an old sailing warship being towed away by a smaller, newer steamship while Q hints at Bond being an old warship himself. The final scene in the new MI6 headquarters shows, hanging on a wall, a painting of a large line of old sailing warships, leaning on the Reconstruction tone of the film.