Refers to both "Toys in the Attic" (a famous album & song by the band) and the prominent toybox mechanism in the game itself. (Not to mention Jackie, a living jack-in-the-box.)
Avengers
Peel
Emma Peel is a character from The Avengers, a British TV show from the '60s that is unrelated to the movie this was based on outside of the name.
Avengers: Infinity Quest
Watson
This may be a roundabout reference to Doctor Strange's prominent role in the game. In the Marvel Cinematic Universe, he's played by Benedict Cumberpatch, who played the title character in the BBC series Sherlock.
Batman '66
Shark
Most likely a reference to the infamous Bat-Shark Repellant scene from the 1966 Batman movie.
Beatles
Purple Martin
Quoting Wikipedia: "The purple martin [...] is the largest swallow in North America." Of course, in this context, it alludes to the band's producer, George Martin.
Black Knight: Sword of Rage
Paris
Deadpool
Guy
Elvira
Curves
If you know absolutely anything about Elvira, this should be pretty obvious.
Game of Thrones
Politico
Possibly a veiled reference to the complex political dynamics and turmoil between the kingdoms of Westeros in the source material.
Ghostbusters
Harold
A reference to the late Harold Ramis, who cowrote the first two films in addition to playing Egon.
Godzilla
Spectre
Spectres is the Blue Öyster Cult album that features the song "Godzilla" (which plays during various portions of the game).
Guardians of the Galaxy
Furry Hats
Presumably an allusion to Rocket Raccoon.
Iron Maiden
Egypt
A reference to the prominence of typical Egyptian imagery in the game's art and design (the sarcophagus lock, Mummy Multiball, and so on).
Jurassic Park
Jaws
Both are extremely popular movies directed by Steven Spielberg. It may more specifically reference the T. rex (either in general or the toy with a moving jaw).
Jurassic Park Home
Minnow
What a minnow is to a great white shark, this game is to Stern's original Jurassic Park.
KISS
Star
A reference to Paul Stanley, "the Starchild", whose facial makeup prominently featured a star.
Led Zeppelin
Ranger
Mandalorian, The
Jennie
Metallica
James
As in lead vocalist and founding member James Hetfield.
Munsters
Grandpa
As in Grandpa Munster.
Mustang
Biscuit
Rush
Finn
Huckleberry Finn was introduced in Mark Twain's The Adventures of Tom Sawyer. The codename references the famous Rush song "Tom Sawyer."
Star Trek
Bill
An allusion to William Shatner, who of course played the original Captain Kirk. (Not in the rebooted film series the game's based on, though.)
Star Wars
Cinnabun, then Donut
"Cinnabun" is presumably alluding to Leia's famous hairdo. "Donut" thematically fits with the previous codename, though its relevance to the theme is less clear.
Star Wars Home
Munchkin
Possibly refers to the machine's smaller size.
Stranger Things
Goonies
Both of these prominently feature adventurous children and are set in the 1980s (the latter by virtue of coming out then, obviously).
Teenage Mutant Ninja Turtles
Jason
Another indirect reference. Jason Vorhees from Friday the 13th wears a hockey mask - much like Casey Jones, a side character from several different iterations of the TMNT.
Walking Dead
Dinner Time
Zombies (or "walkers") eat people. Not much else to say there.
WWE
Dudes
This may be an extremely nondescript reference to the male wrestlers featured in the game.
I apologize in advance if this is redundant and/or extremely obvious, but I felt like compiling a list of connections between each game and their codename. Some of them escape me, but here’s all the ones I could identify (within reason):
Game
Codename
Explanation
Aerosmith
Toys
Refers to both "Toys in the Attic" (a famous album & song by the band) and the prominent toybox mechanism in the game itself. (Not to mention Jackie, a living jack-in-the-box.)
Avengers: Infinity Quest
Watson
I assume this is a roundabout reference to Doctor Strange's prominent role in the game. In the Marvel Cinematic Universe, he's played by Benedict Cumberpatch, who played the title character in the BBC series "Sherlock".
Batman '66
Shark
Most likely a reference to the infamous Bat-Shark Repellant scene from the 1966 Batman movie.
Beatles
Purple Martin
Quoting Wikipedia: "The purple martin [...] is the largest swallow in North America." (I honestly didn't know this before I looked it up while typing this post.) Of course, in this context, it alludes to the band's producer, George Martin.
Elvira
Curves
I really don't think I need to explain this one.
Game of Thrones
Politico
I figure this is a veiled reference to the complex political dynamics and turmoil between the kingdoms of Westeros in the source material.
Ghostbusters
Harold
A reference to the late Harold Ramis, who cowrote the first two films and played Egon in them.
Guardians of the Galaxy
Furry Hats
Presumably alluding to Rocket Raccoon. (It's been a bit since I've seen the movie, so I don't know if there's a more specific reference being made here or if it's deliberately vague. The latter is more likely, since codenames obviously shouldn't give too much away.)
Iron Maiden
Egypt
A reference to the prominence of typical Egyptian imagery in the game's art and design (the sarcophagus lock, Mummy Multiball, and so on).
Jurassic Park
Jaws
Both are extremely popular movies directed by Steven Spielberg.
KISS
Star
A reference to Paul Stanley, "the Starchild", whose facial makeup prominently featured a star.
Metallica
James
As in lead vocalist and founding member James Hetfield.
Munsters
Grandpa
As in Grandpa Munster.
Star Trek
Bill
An allusion to William Shatner, who of course played the original Captain Kirk. (Not in the rebooted film series the game's based on, though.)
Star Wars
Cinnabun, then Donut
"Cinnabun" is presumably alluding to Leia's famous hairdo. I have no clue what "Donut" refers to, aside from thematically fitting the original codename.
Star Wars Home
Munchkin
I assume this refers to the machine's smaller size?
Stranger Things
Goonies
Both of these prominently feature adventurous children and are set in the 1980s (the latter by virtue of coming out then, obviously).
Teenage Mutant Ninja Turtles
Jason
Another indirect reference: Jason Vorhees from Friday the 13th wears a hockey mask - much like Casey Jones, a side character from several different iterations of the TMNT.
Walking Dead
Dinner Time
Zombies (or "walkers") eat people. Not much else to say there.
WWE
Dudes
I assume this is an extremely nondescript reference to the male wrestlers featured in the game?
Thank you! I went ahead and copied a version of my table there (now featuring all the codenames that were there previously, as well as mentioning @Shaub’s suggestion about Jurassic Park).
