Faith Astor scores a triple whammy, citing El Dorado, The Legend of Sleepy Hollow, and tobacco advertising in a single paragraph. Pretty good, especially for a nine-year-old girl (Ouch!My shin! Ten, I meant ten!) who was probably in kindergarten when the Marlboro Man billboards were banned in Illinois.
Warned by Nick that the police are searching for a pair of suspected kidnappers, Harry guesses that the suspects match the descriptions of Mickey and Donald.
Bitter, Faith dismisses Disney specials she's seen where parents automatically adore their kids as nonsense.
Harry sarcastically says "And maybe Elvis and JFK are shacked up in a retirement home somewhere"—a reference to Bubba Ho-tep, a Bruce Campbell film.
The short, blonde demon fighter, Karrin Murphy, says, "you have fruit punch mouth." In the season 1 finale of Buffy the Vampire Slayer, the short, blonde demon fighter, Buffy Summers, says the exact same phrase, albeit under very different contexts.
In the short story with Thomas' birthday, when a Black Court vamp starts threatening them over the intercom, Harry quickly asks what she was like in life. One girl responds that she wasn't all that popular, and some of the kids picked on her.
Several Greek Mythology references from the villain, which makes sense because she's a maenad.
"Bigfoot On Campus":
Scolding River Shoulders for not meeting Irwin face-to-face, Harry points out that the sasquatch could hire Superman to look out for his kid, but even he wouldn't be a better choice than the boy's actual father.
"No man is an island, entire of itself. It tolls for thee." - paraphrases John Donne
In "Love Hurts," Murphy's line about disliking coincidence is very similar to a common phrase used by Spenser. This is further established when Harry comments on Murphy's dislike of "reading Parker." (There's actually a very strong Parker influence on The Dresden Files in general; the often-used blurb of "Spenser crossed with Merlin" is very apt.)
"Remind me — how much do we pay you to give us advice, Sherlock?"
Harry's heart does the drum solo from "Wipeout".
The villain is sarcastically referred to a "Florence Nightingale with fangs".
Harry tells Murphy to "make like The Dukes of Hazzard" because his car door's stuck. She doesn't believe him, and opens it without a hitch.
Under the love spell's influence, Murphy starts snickering over marginally-risque words, a la Beavis And Butthead.
The gunman who aided the villain is nicknamed "Billy the Kid" by Harry.
Murphy's use of "Martian" is a reference to the book Men Are From Mars, Women Are From Venus.
The title of the prequel comic is pretty obviously a reference to the Guns N' Roses song.
Coupled with the early narration courtesy of Harry, the title makes another obvious reference to Upton Sinclair's novel, The Jungle, which was set in early 20th century Chicago. Harry even lampshades it by quoting from the book.
The man who cautions Major Talbot about offending the hookah-smokers in 1917 Cairo is presumably Major T.E. Lawrence, whose life story inspired Lawrence of Arabia.
The Major's body, according to Bob, was found mummified at the British Museum. The illustration shows his mummy with its eyes wide open, implying he'd been mummified alive, much like Imhotep from both 1932 and 1999 versions of The Mummy.
The powers which Mayor Ceder's jinn companion once served make the ghoul and goblin look like Tom and Jerry by comparison.
When the RPG books discuss the White Council's weakness in dealing with dark magic, Harry has a note scribbled in the margin about possibly taking a page from "that other spellcasting Harry's book" and teaching a Defense Against the Nastybad Arts class.
One set of margin notes in the RPG rulebooks consists of nothing but a string of Holy Grail references.
One passage includes Inigo Montoya's famous quote from The Princess Bride. Nearby, Harry has written a margin note that says "STOP SAYING THAT!"
The RPG makes the same Young Frankenstein joke ("Werewolf?" "There wolf") as Fool Moon. In the index, between the entries Wereravens and Werewolves. Classic.
When Billy points out that Harry first saw the Black Dog (Welcome to the Jungle) that attacked him in the rear view mirror, and points out that it could use mirrors as a point of entry or as part of its manifestation, Harry remarks "Check out the big brain on Billy!"
The index uses a code system to show which book and page contains the information: YS means "Your Story" (the player and GM handbook), and OW means "Our World" (the sourcebook). One entry uses this to good effect:
In-universe example: Thomas's boat is named the Water Beetle, a Shout-Out to Harry's beloved car. Its every appearance is likely to reference Jaws, as it looks like Quint's fishing boat.
Harry's own name could also count, since he's named after three stage magicians (Harry Houdini, Bellamie Blackstone, and David Copperfield), which he explicitly points out. And though Harry doesn't mention it, Word of God confirmed that it's also notable that his last name is Dresden. As in, "Firebombing of."
Although the RPG suggests that Dresden's first name is a reference to Cast a Deadly Spell. Harry himself, of course, promptly sets the record straight (in the margins) with the in-universe explanation.
Word of God has it that Billy and Georgia got their names because Butcher's wife watched Ally Mcbeal in the evenings while he was writing Fool Moon.
The prescient, Abby, named her Yorkie "Toto" in a deliberate The Wizard of Oz reference.
Chandler's nickname of "Steed" is a reference to The Avengers. His dress-sense may be a deliberate reference as well.
The pseudonym of "Ms. Demeter", another Marcone associate, has Classical Mythology implications that Harry himself points out.
Justine's name is a very clear reference to the Marquis de Sade's novel Justine, The Misfortunes of Virtue which follows the sex- rape-filled life of a virtuous but naive young girl.
One of the Alphas is named Kirby, likely in reference to Marvel Comics' Jack Kirby.
Flickum bicus is a brand name reference, which sort of counts.
The Doom of Damocles gets its name from a classical Greek legend.
Dracula (when referencing the Black Court vampires). In-universe, the book was actually commissioned by the White Court to make the weaknesses of Black Court vampires known. But woe betide the wannabe slayer who's only seen the movies or assumed all the usual vamp tropes come from Dracula.
This completely justifies in-universe use of the term "Renfields" to refer to mind-raped Black Court minions.