Shout Out / Ion Fury

Wooh boy is there a lot of em. So many that we've sorted them by chapter.

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General

• The main menu art is an homage to the title screen of Wolfenstein 3-D.
• Similarly, the first key art for Ion Fury was fashioned after the box art for the PlayStation version of Doom.
  • The final key art is clearly inspired to the one for the Microsoft Windows version.
• Shelly's one-liners in combat:
  • "Dodge this!".
  • "Oh my God, the quarterback is toast!"
  • "Worthless consumer models..."
  • "Laputan machine!"
  • "Yippee Ki Yay, motherfucker!"
  • "Domo arigato, Mr. Roboto!"
  • "Toasty!"
  • "I got ninety-nine problems but a bitch ain't one!"
  • Apparently, Shelly is a big fan of The Offspring, quoting them on two separate occasions ("Dance fucker, dance." and "Ya gotta keep 'em separated!"). The skull logo adorned on her Bowling Bombs also bears some resemblance to the band's flaming skull logo.
  • "This is my Boomstick" when she picks up the shotgun.
  • Upon getting the Ion Bow, Shelly quotes Clarence Boddicker.
• A whole lot of generic decor around the maps are shoutouts:
  • A common bit of graffiti is "Pigs Are Cops", referencing Duke Nukem 3D. There's also "Nukem All!". There's another type of graffiti that says "They put dog meat in your burger", referencing the Duke Burger level.
  • The posters promoting Jadus Heskel's homicidal services, with a set of six pictograms depicting various ways to die. All six come from the original Rise of the Triad's quit messages.
  • A flyer for Big Bill Hell's can be found.
  • "Mark's Relationship Counseling Service" advertises itself with the quote "I did not hit her. It's not true. IT'S BULLSHIT! I did not hit her. I DID NOT!"
  • Posters for a fast food joint called "Caco Bell", with a cacodemon mascot. You can also see large billboards in the city for a film called "Thy Flesh Consumed".
  • A poster for "Damn good coffee... and hot!"
  • All clocks in the game are set at two minutes to midnight.
  • Bathrooms have condom dispensers with the slogan "Who wants some Wang?"
  • Desktop computer monitors show a screenshot of the Dopefish easter-egg from Quake.
  • Periodic tables in laboratory environments have the words "Science, Bitch!" scrawled onto a corner.
  • A framed motivational poster that contains a picture of a trophy with the words "You're Winner".
  • An advertisement for a restaurant "Cannibal's" has "Itchy. Tasty." as part of its marketing slogan.
• The cheat code "IMLIKEMAX" lets you "Feel the Payne" with Bullet Time.
• The Game Over screen that appears if you wait a few moments before restarting the level consists of a bloody "YOU DIED" which bears more than a passing resemblance to the Game Over screen of the original Resident Evil games.
• The logo of the Haskell programming language appears in the walls in several places in The Washington Institute. And considering it appears in Dr. Heskel's recruitment poster mentioned before, it also makes Heskel's name a Punny Name.
• Completing a zone after killing every enemy and finding every secret in each level nets you the phrase "Get psyched!" at the status screen.

Night on the Town

• Not two minutes into the first level you'll find "Flynn's Arcade", whose games all sport titles and art from old platform games by Apogee (which would later become 3D Realms).
• Activating the ATM outside the bar has it throw money at Shelly while saying "Shake it, baby!"
• A particularly hard to reach secret area in the first map holds an origami unicorn, at which Shelly comments "Like tears in rain."
• The introduction to Mechasects plays out identically to the first fight with a Skaarj Hunter in Unreal, with the lights steadily going out in a long hallway before the player is suddenly attacked under flashing red emergency lights.
• A storefront is named "Bennett's Steam Letting Co." and inside it there is a man impaled with a pipe.
• You can find Vega's mask at the bottom of a shaft in Cultural Divide.
• Cultural Divide's biggest setpiece is a wall of multicolored shipping containers blowing up when an additional container is placed on its side to complete four rows.
• One of the houses on the far side of Cultural Divide's latter half has a pizza on its roof.
• A secret area is an exact recreation of Apartment 302 from Silent Hill 4.
• Another secret area is the apartment from Hardware (1990), complete with M.A.R.K. 13's skull lying in the shower.
• Heskel, before the ambush at the end of the first zone will state "Despite all your rage, you're still just a rat in a cage!"
• There's posters for Big Bill Hell's Cars, advertising BAD DEALS!, THIEVES! and CARS THAT BREAK DOWN!

Downtown Disaster Relief

• The warmechs on standby in their hanger in Alphabet Soup are part of the "Mobile Armor Division", with the pilots' names being "Makabe", "Johnson", "Akkaraju" and "Ishikawa".
• A wrecked bus in DC Meltdown has its destination marked as "439 Sandy's City", referencing the name of a Doom II song which happens to be four minutes and thirty-nine seconds long.
• One secret is a test chamber lifted right out of Portal, complete with a Companion Cube and a fake cake. Shelly even mutters to herself, "They promised me cake..."
• In the mall, you can find one of the killer robots from Chopping Mall hidden in a secret room.
• Another secret is a garage containing Max Damage's car, prompting Shelly to cry out "Wasted!"
• A store window in Nukage Nightmare has a headless mannequin wearing Duke Nukem's outfit.

Institutionalized

• A limousine parked outside of the skyscraper has the licence plate "LU FIST", referencing the limo-owning character Love Fist from Grand Theft Auto: Vice City.
• An out-of-bounds message found near some stairs is "Stairway to Heaven".
• Godot's mask can be found on a desk in The Washington Institute.
• At the beginning of the second level, when the elevator is stopped, Shelly will quip "So much for the express elevator to hell."^note The Express Elevator to Hell is the title of a map in the Master Levels expansion for Doom 2.
• A secret area is the red room from Twin Peaks. Shelly comments with a quote from Fire Walk With Me: "Now ain't this dreamy?"
• The recipe for the toxic goop seen throughout the game can be found in Subhuman Resources, with three of the ingredients being sugar, spice and "Product X". Another ingredient is "E621", the name of a NSFW furry imageboard.
• Interacting with some particular computers in Subhuman Resources yields security cam footage of Blood Run Tourney, a user-made deathmatch map from Quake III: Arena. One of them has an open chatbox with the unsent message "Oh shit! Someone is her", suggesting that the Mooks were running a LAN session when Shelly burst in.
• A secret room contains the Orgasmatron from Barbarella.
• While going down the elevator after the boss fight, two of the floors you pass are textured to resemble grey-brick rooms from Wolfenstein 3-D.
• In Grand Slam, a table with a food tray holds the "I'm Free!" easter egg drawing from Rise of the Triad.
• Again in Grand Slam, there are pieces of paper on the walls reading "DO BASEBALL" as in Streets of Rage 2.

The Six Underground

• Upon encountering the game's first Skinjob enemy, Shelly exclaims "This is the worst I've seen yet. This man has no dick!"
• A secret area in the first level is a reference to Chernobyl, complete with an A3-5 (AZ-5 in Latin alphabet) button and Shelly parroting Dyatlov's "not great, not terrible" quote.
• "Say Aardwolf" can be found graffiti'd on a wall in Tunnel Disturbance.
• Newt's hideout can be found in the vents of Power Up!, complete with the severed head of her doll.
• A hidden room contains a flayed corpse with the bloody writing "I AM IN HELL HELP ME", which Shelly identifies as "Uncle Frank". A switch in this room opens another secret area, which contains hanged hooks and a bloody mattress with the spinning block from Hellbound: Hellraiser II. Here Shelly exclaims "Holy shit!", quoting Tiffany.
• When Shelly gets the power up and running in Power Up! the utters the memetic line "Praise the Sun!"

Countryside Carnage

• In Knee Deep, a sewer level, a red balloon can be seen floating beyond a fenced-off pathway. Shelly even snarks "I guess they really do float." The stop sign on the fence also has a message scrawled on it: "Stop, Corroborate and Listen."
• A hidden rec-room in the sewers is filled with pizza and scattered ninja weapons.
• When entering Heskel's House of Horrors, Shelly quips "I am the one who knocks".
• In the kitchen area of the House you can activate a microwave oven. Doing so will prompt Shelly to ask "Is that a hamster"?, before the oven is covered in blood from the inside with an audible pop.
• In one secret area, you can find the dead body of Dangerous Dave. Look closely, and you'll see he's got a pixellated id Software logo on his hat.
• Shooting the moon outside the mansion causes it to say "Ow" in text and eventually fall from the sky, just like in Terminator Future Shock and its sequel Skynet.
• The entrance of the crypt has four graves — Caleb ("Beloved gunslinger."), K. Katarn ("Retconned."), Slade ("He took no prisoners.") and Somebody ("You magnificent bastard.")
• In the crypt's lower floor, a hidden passage reveals an elaborate tomb to Doge.

Ordinary Laboratory & Subterranean Climax

• A secret room in Hellmouth is a recreation of the Tyrant lab from Resident Evil, where you can find Jill Valentine's beret.
• A trap in Parting Procedure is a chamber that locks you in before fireballs spit out from one wall, forcing you to duck underneath them until they stop. This is an exact recreation of a similar trap from Blood.

Aftershock

• A billboard seen in the background of Joyride is the poster from AKIRA, with Shelly approaching the Hoverbike.
  • There is also an ad for Lightning Fast VCR Repair.
• Collecting the Homewrecker will have Shelly spout "I'm gonna wrrreck it!"
• The GDF Crime Prevention Kit is blatantly just RoboCop's helmet. It gives Shelly servo sounds when she moves, a new portrait, and infinite ammo for a drastically-enhanced Loverboy. She may even exclaim "Your move, creep!" when activating it.
• In the same level there is a mega secret involving a giant shaft with a needlessly long ladder.
• In the graveyard area in Not From These Parts you can find a grave with a planted pitchfork and a familiar hat on top. Also nearby is a crypt with the name Kain and the epitet "Refused the Sacrifice".
• The Golden Gun power up has the same function as The Tome of Power, powering up all of your weapons to more powerful forms.