Bad-Guy Bar: Frank non-chalantly walks into a bar full of mob thugs, none of whom recognize him until he pulls his guns and kills them all. In a bizarre coincidence, a cop was hanging out at the bar but not killed because he was in the bathroom.
Broad Strokes: The game is kind of a sequel to the 2004 Thomas Jane film, due to Jigsaw actually being John Saint, son of Howard Saint. However it now takes place firmly in the Marvel Universe, and even features a rematch between Frank and the Russian.note Whom Frank already killed in the movie. If it was fun the first time....
Guns Akimbo: When using two weapons it's up to the player which one to shoot, making it possible to either go Woo-style, shoot both at once of pull a 'New York Reload'.
Hand Cannon: One of the handguns is literally named this.
Heroic Bystander: In the zoo mission a few workers, when rescued, will take guns from dead enemies and help Castle as much as they can: one explains that, after witnessing the Gnuccis killing many animals senselessly, he wants to protect the ones left.
Hey, Catch!: One of the "Quick Kills" the Punisher can perform, is to toss his longarm at an enemy who will reflexively catch it, distracting him. The Punisher then shoots/stabs the guy in the face while he is distracted.
High Voltage Death: In the Rykers Island level Frank comes across a inmate strapped into an electric chair. After interrogating him the player can then choose whether or not to fry him.
Not long later, he has to destroy a generator on the roof to cut the power and open a gate inside. Instead of wasting bullets, he can just grab an enemy and throw him on the generator - killing two birds with one stone, as they say.
The Russian: "Bullets are like mosquitos to the Russian!"
In Case of Boss Fight, Break Glass: The robot boss has some glass panels in its head but those go first and breaking them is no impediment - you have to literally punch the thing into scrap to win (It somewhat resembles the car-wrecking bonus stage in Street Fighter II - the thing keeps losing more and more parts as you beat it up.)
Infernal Retaliation: Using the flamethrower will occasionally cause flaming mooks to run into and damage you. Also The Russian during the fianl phase of his boss fight.
Jack Bauer Interrogation Technique: One of the main selling points of the game is the ability to inflict this on every mook you come across. Did we forget to mention that successfully breaking a mook is one of two ways for Frank to regain health?
Mythology Gag: There's a lot of references to The Punisher's history scattered throughout the game, both pre- and post-Ennis.
The Russian, the Gnucis, Frank's neighbors, Soap and Molly are all taken from Garth Ennis' run.
Two of the supervillains Frank fights, Bullseye and Bushwacker, are two he's fought in his comics as well. Damage is also a previous villain, who ended up as a cyborg in the comics.
The line "How many people have you killed?" "Not sure. There were a lot of explosions" is taken verbatim from a scene in one comic where Frank is confessing his sins.
The boss fight with the Russian looks like it might have been inspired by a short story from one of his issues where he's interrogating a child kidnapper. At least, a lot of the methods Frank uses on the Russian are the same he used in that story.
The name of the Yakuza group "The Eternal Sun" is taken from a group of criminals Frank once fought.
Oh, Crap: Most of the dialogue of the mooks consists of this.
At one point the Russian knocks out Nick Fury while shouting "it's clobbering time!" He even tells that the Thing is popular in Russia, in line with his chracterization as a fan of American superheroes.
Super Mode: In "Slaughter Mode", the Punisher regains health and uses a limitless supply of dual throwing knives.
Throwaway Guns: When the Punisher is wielding a pair of two handed weapons (assault rifles, shotguns, machine guns, etc.), rather than try to reload both weapons at once he just tosses aside the second weapon.