The opening scene between The (new) Elder and John starts off with The Elder giving a philosophical speech to John to dissuade John from shooting him. The Elder tries to convince John that "I'm afraid, you've come a very long way, for nothing." but John replies nonchalantly "Yeah. Not really." and sends The Elder almost-back-flipping over his furniture from a Boom, Headshot!, in a nearly cartoon-like fashion.
In Caine's first big action scene in Osaka, he slaps several motion trackers on the walls to alert him of incoming assailants, each making a goofy doorbell sound upon activating. He also takes a moment to adjust one after realizing he placed it too high.
While nonlethally dispatching the Continental fighters, Caine knocks one out with a silly windup bolo punch.
Whether it was for a cleaner shot or out of pettiness, midway through his escape from the Elite Mooks in the Osaka Continental, John decides to kick one while he's down. In the balls. The stunned mook can only reel upward in pain as he pops his head up, lining it up perfectly for John to shoot him in the head. John then proceeds to shoot another downed mook in the head without attacking their groin, showing that John didn't need to do this and seemed just to do so for shits and giggles.
Turns out the Osaka Continental has their own version of elite mooks: two gigantic sumo wrestlers in bulletproof kimonos. They easily demolish a group of the armored High Table agents, and seem to have a good time doing it.
During the nunchuk fight, John smacks one of the Japanese gunmen in the nuts. He collapses to the floor, and gets back up as John deals with the other mook, John turns around, the first mook covers his face, John sees this, holds his hit, and then hits the poor guy in the crotch again.
The mere fact that the Tracker/Mr. Nobody, like Sofia before him, has trained his dog to have Groin Attack as one of its attack commands. Many unfortunate mooks as well as Chidi himself end up having their junks bitten by the Tracker's dog over the course of the movie.
Nobody's simply on John's tail for the money — a refreshingly simple motivation amidst a huge network of personal vendettas and corruption — and the film has some fun acknowledging the sheer banality in how Nobody handles this pursuit, directly highlighting in his negotiation with The Marquis that he wants the bounty invested in his 401k. Considering he appears to otherwise be a vagrant, one has to wonder what exactly is the retirement plan he has in mind where a $5 million difference to a $20 million bounty is considered a deal-breaker.
The exchange between the Babushka collecting guns at the Ruska Roma Church in Berlin and John Wick:
John enters the Ruska Roma headquarters, which is a church, to talk about being brought back in. He asks the elderly priest to speak to Pyotr, the head of the Ruska Roma, only for the sentence to barely leave his lips as the old man pulls out a shotgun and blast John back several feet, only surviving because of his suit, which the priest compliments him on.
After being freed from the noose, John and Katia prove they very much grew up together when, despite the how dangerous and dire the situation they are in, immediately begin squabbling over the fact Katia didn't promise to give John a crest when he finishes off Killa.
John negotiates his mission with the Ruska Roma to assassinate Killa, and gets escorted to his nightclub by a man named Klaus (incidentally played by famed Club Berghain head bouncer Sven Marquardt). We learn this as their conversation goes as follows:
Klaus: I am Klaus. [whacks John across the face with a blackjack] John:[wincing in pain] ...John. Klaus:I. AM. KLAUS![smacks John again]
In the very next scene as he hands John off to Killa at his table, he relays "I am Klaus" one last time before leaving.
When Killa insists on his hammy, over the top poker game with John, Caine, and Nobody the Tracker, the three protagonists are all just as non-plussed and annoyed at his theatrics as the others. When he reveals his cheating, all three are exasperated and, even though they all want to kill each other, take a moment to mock Killa before pulling a short Enemy Mine against his goons.
Caine even correctly guesses the cheating hand Killa presents (five of a kind) without anyone having to tell him. When he asks, John and Nobody both respond with a tired "Yeah".
Caine:[in Cantonese] I knew you were a cheating prick. Wick:[in Cantonese] Yeah... total prick.
What's funnier is that the subtitles downplay the severity of the language employed by both Caine and Wick here. Both of them say "踣街咸家鏟", which literally translates to "Drop dead, may your whole family be bulldozed" and figuratively to "You're a piece of shit, fuck you", thus also making it a Precision F-Strike moment for Wick.
It's worth pointing out that Killa takes his marching orders from the Marquis, and therefore is technically on the same side as Caine and the Tracker; but when push comes to shove the two would rather work with the man they were supposed to kill against a gaping asshole like him.
Killa spends much of the ensuing nightclub fight running away from John, allowing him to get potshots from behind, leading to amusing facial reactions and a bizarre Berserk Button being pressed that finally forces Killa's hand and makes him fight John one-on-one. And the 300-lb asthmatic turns out to be the toughest crime boss in the entire series.
In a Black Comedy example, Killa's death in the same scene has him land headfirst on the bottom of concrete stairs, freezing his body's expression into a wide-eyed, goofy stare. John then proceeds to punch his body in the mouth repeatedly until one of his gold teeth come loose, allowing him to present it to Katia as proof of his death.
With his ticket mended and given a Crest that allows him to represent the Ruska Roma in a High Table duel, John is asked by their current leader, Katia, who he chooses to nominate as his Second. Cue Answer Cut to Winston, who is shown walking over to the Marquis in his art gallery to present the terms of the duel... and walking, and walking, and walking. He walks the entire breadth of the gallery, taking just under a minute to reach the Marquis, in quite an amusing breather after one of the most intense fights of the film.
John Wick and the Marquis are tasked with deciding the rules of the duel via an ornate game of cards. When asked on when the duel should take place?
And the result? The Marquis has the higher card than John, meaning John cannot end this immediately.
During the talk on the duel rules, John is informed if he wins, not only are his debts cleared but Winston is reinstated with the hotel rebuilt. John gives his friend a "really, dude?" glance as Winston just responds with a "hey, what do you expect" shrug.
A Black Comedy example: During the top-down Oner in Paris, one poor sap in the apartment's kitchen gets set alight by a Dragon's Breath round igniting the stove pot in front of him, and is left to run blindly around the area for several seconds before being put out of his misery with another Dragon's Breath round.
After John fires the gun with the Dragon's Breath rounds loaded, he briefly sets the gun down, as if in wonderment.
In the same scene one mook does an absolutely Unnecessary Combat Roll... and gets shot the instant he stands up from it.
From the climactic fight on the staircase to the Sacré-Cœur:
The beginning of the climb itself needs to be mentioned. As the radio announcer says that there are approximately 222 steps to the top, John briefly pauses and looks up, most likely thinking to himself as to why did he pick this location in the first place.
John manages to climb his way to the top, only to meet a squad of mooks and Chidi. He gets kicked down and tumbles down a flight of stairs... and another... and another... and another. All in one shot, and all as Chidi slowly trots down over to him. When it looks like John has finally reached the bottom, the camera pivots to show that he's only halfway down. Chidi throws him into a lamppost sending him barreling down the rest of the steps.
When the film was released on DVD, the official Lionsgate YouTube account posted a video featuring John rolling down the stairs… for 10 hours.
Nobody the Tracker has just recently been spared by John earlier so that John could save Nobody's dog from Chidi, so Nobody is visibly debating whether to finally kill John or return the favor… cut to his dog giving him Puppy-Dog Eyes for the most obviously telegraphed Heel–Face Turn in the film.
The ensuing gunfight is audible from the Basilica at the top of the stairs, which leave Winston, the Marquis and the Harbinger all awkwardly staring at each other as distant gunshots are heard below.
Chidi: You can't shoot me. Caine:[frustrated sigh] Yeah, you're right. [Later] Caine:[nails Chidi with a messy hook] But I can hit you, motherfucker. [spits]
During the fight, Caine shoots one mook point blank in the head, leaving a large splatter of blood on him and his white turtleneck, and he acts completely disgusted.
As John and Caine approach their duel Caine off-handedly stabs John through his dominant hand in such a brutal manner that you can't help but find it hilarious. John's reaction to that happening amounts to exasperated wincing.
As somber as the moment is, John and Caine doffing their jackets as dozens of bullets can be heard tinkling to the ground provides a bit of levity ahead of the climactic duel.
Before the final duel, the Marquis attempts a last threat/moral booster to Caine, who promptly and bluntly responds with perfect comic timing.
De Gramont: Remember your daughter. Caine:[almost immediately]Fuck off!
It's the sheer exasperation in Caine's voice that sells it - he sounds like he's moved past hating de Gramont and just wants the whole mess over and done with, but the latter's incompetence keeps getting in the way of a reunion with his daughter, and Caine's had just about enough. Notably, the Marquis actually listens to somebody for once in the movie, and promptly fucks off; even he must've realized Caine was reaching the end of his rope.
Made even better in contrast afterwards when Winston, also giving advice to his champion, simply tells John to "just have fun out there!"
After an incredibly satisfying end to the duel, where Winston reminds the Marquis that John "...didn't shoot." his last shot. The Marquis turns to face John with a horrified Oh, Crap! look on his face like he knows what's coming next. John mutters in a tense tone "Consequences." and gives the Marquis a shot to the forehead before he can react and evade. It cuts to Mr. Nobody, sitting on a nearby bench chuckling and saying, "That's fuckin good!"
. In his makeup from this sequence.