Previous John Wick films are filled to the brim with Head Shots. This movie has plenty of those, but apparently the action choreographers wanted to spice things up and include some different attacks. Specifically, Nut Shots. Lots and lots of Nut Shots. There's basically at least one in every major action scene.
While John faces off against Ernest in the New York Public Library, Ernest briefly pauses their fight to shush John, then immediately slams him very loudly against several shelves.
Randall Duk Kim's Doctor character, not wanting it known that he helped John after his excommunicado went into effect, advises John to shoot him. After he does, he then realizes one might not be enough then asks John to shoot him again. The fact that John interrupts him both times as the Doctor tries to tell him to be accurate is just icing on the cake.
John's disbelief when the doctor wishes him luck, as the doctor is bleeding from two gunshots.
John is fighting Huang in an armory. During the fight, the two quickly glance around and both seem to come to the realization that "oh yeah, we're literally surrounded by weapons to use, let's use them". Cue the two smashing apart one glass drawer for each of them to grab some blades.
Keep an eye out during the fight and you can see that a few knives just end up hitting the other guy handle first.
Special mention goes to the one poor unfortunate mook who keeps getting knives thrown into him, non fatally. From both John and his allies.
At the end of the fight, a very injured Huang tries to pull out of a knife from his gut. In the background, a tired John just casually picks up an axe and, almost as an afterthought, throws it... right into Huang's head.
The Bowery King continues to absolutely not give a fuck during his conversations with the Adjudicator, after he's asked for a show of "fealty".
During the fight, one of the dogs successfully prevents a mook from firing his gun by biting his wrist and dragging him down with it. The mook then gets his head blown off in the fight's final moment... and the dog continues growling and tugging at the corpse's wrist. Even funnier is how neither human bothers telling it to leave off.
Before dropping John off at the desert, Sofia drinks all of John's water before gargling it and spitting it back into his bottle.
A bit of meta humor, but the US release of this film also coincides with A Dog's Journey, which is a film featuring dogs. He probably would try and wind down with that one after the events of the film.
The absurd number of times John gets thrown through glass cases by Zeros guys during the climax.
Upon meeting Zero in Grand Central Station, John casually kills an assassin behind him.
John: Is he with you? Zero: He was.
When Zero is about to kill John after the High-Speed Battle, John quickly puts a hand on a step nearby... which is the Continental's staircase. Judging from Zero's complaints to Charon immediately afterward, John was essentially calling "base" like it was an Absurdly High-Stakes Game of tag.
Zero repeatedly giving Johns excited thumbs up or other signs of fanboy approval, even when Johns killing his own students.
Zero's general fanboyism, including him trying too hard to sell himself as a Worthy Opponent. He attempts to evoke Not So Different, and John seems more annoyed than offended.
We get a hilariously awkward scene of him trying to sit next to John on a couch (close enough for their legs to be touching). A very annoyed and tired John just gets up and sits on a chair perpendicular to the couch.
When John's dog appears, Zero is amazed to see "THE Dog". Critical Research Failure on Zero's part (considering THE Dog was Daisy, who's dead).
Zero trying to give his Not So Different speech while Dog licks John's face all over.
At the end of their duel, Zero is again trying to sit up next to John... with a sword stabbed through his chest.
Zero: Hey John, that was a pretty good fight, huh? John: ...yeah.
Two young would-be assassins walk menacingly toward John in Grand Central Station...and then they both get unceremoniously killed off in public by Zeros guys.
The first time John arms himself in the vault Charon spends a few seconds explaining him a new type of bullet developed for their handguns. When they try using it on the High Table's troops it has no effect as their armor are upgraded and they are forced to fall back.
The first time John ends up going against the heavily armored High Table troops, at one point he tries whacking one in the face... and only ends up hurting his hand. You can even hear him muttering "ow" under his breath.
John and Charon return to the vault of the Continental to rearm with heavier firepower. Winston just watches them while sipping brandy and not saying a word.
John frustratingly knocking on the door and telling Winston they need more firepower, Winston just waves his arms at the wall of guns.
The Adjudicator calls up Winston to deliver a "if you think you can survive" warning. Winston just hangs up on them after a few words. It's the first time The Adjudicator shows an emotion, in this case shock.
The second time John and Charon leave, Winston doesn't even wish them well, he just locks the vault with a little remote like he's a suburban dad closing a garage door!
John's Dog is sitting next to Winston the entire time, curled up and not moving. Sofia's combat canines he is not.
At the very end, after John has been shot off the roof of the Continental by Winston and left for dead he encounters the Bowery King again whos also messed up by Zero delivering the seven slashes dictated by the High Table, but very much alive. The Bowery King gives a short but very emphatic speech about how pissed off he is, then asks John's unmoving and bloodied body if hes pissed as well. John has to raise a hand to show he heard it... only for the Bowery King to start laughing at Johns severed ring finger... so John gives him the finger instead. His laughter only increases at that.
The Tick Tock Man delivering a barely conscious John to the Bowery King in a shopping cart.
At one point while John is engaged in CQC with two thugs, all three manage to run out of ammo at once. There's an awkward Beat before a race to reload. John wins.
The fight between John and the two shinobis (played by Yayan Ruhian and Cecep Arif Rahman) is tense and amazing, but once John manages to separate the two, we discover that John is actually about a head and a half taller than the two, so he proceeds to deliver an honest-to-god belly-to-belly suplex and Angle Slam on them.
The end of the fight after they all went through the glass floor the two shinobi try to stand up with their hand grasping their karambit. Wick, having used them to break his fall, is already up on his feet with a sword in his hand telling them "be seeing you", both wisely decide to stay down.
Earlier, the two Shinobi show Villain Respect to John, helping him after they knock him down. The second time that happens, John just brushes them aside with a silent "give me a moment, I've got this" gesture. Then John takes out his belt and gets serious.
This exchange, following a scene in which Winston has shot John numerous times in the chest, culminating in him falling from the roof of the Continental:
Adjudicator: John Wick is gone. Winston: Yes, a tragic loss— Adjudicator: I mean his body is no longer on the street. [Beat] Winston:Seems improbable.
Keanu Reeves has admitted that director Chad Stahelski convinced him to film the Actor Allusion mentioned on the main page with the promise that they would only do one take and that it wouldn't be used in the film. Halle Berry's reaction to learning that was pretty much "Yeah, that's what they always say."