Quite a few Shout Outs pepper this, the ninth novel of The Dresden Files. With a serial killer stalking practitioners and unrest in the White Court, trouble and pop culture-savvy snarking are sure to ensue:
The clue that confirms to Harry that the killings are related is a Bible reference.
In a later moment's Self-Deprecation, Harry snarks that he'll try turning water into wine and walking on water after he finishes his current nigh-impossible tasks.
He reminds Lara that "pride goeth" in another scene.
Harry describes the woods around Castle Raith as "Lovely, dark and deep," a clear reference to "Stopping by Woods on a Snowy Evening," a poem by American poet Robert Frost. He also compares it to Sherwood Forest.
Priscilla greets Harry with a scowl of Dickensian disapproval.
After a psychic attack leaves him with a world-class headache, Molly's booted footsteps sound like Godzilla-sized tromping to Harry.
Elaine uses a spell that causes whirlwinds by twirling something over her head. The Mighty Thor uses the same method, and Jim Butcher has shown himself to be a big Marvel fan.
Conversing with Lash, Harry reminds himself that every concession to her reasoning brings him closer to signing on with the Legion of Doom.
Anna's suspicions of the Wardens get Harry making sarcastic 1984 cracks.
The ward on her apartment, in Harry's opinion, is a decent warning system, but no more of a defense than the house of straw from "Three Little Pigs".
Later, he considers making a Big Bad Wolf entrance to Anna's apartment, perpetuating the "Three Little Pigs" motif.
Having just watched Molly react erotically to a dead woman's residual memories, Butters feels a bit "Nabokovian" until Harry confirms she's no longer underage.
The clothes worn by a captive ghoul in Harry's New Mexico flashback remind him of Lawrence of Arabia.
Harry recites the opening lines of a classic dirty limerick when Murphy chides him for how he never stops joking.
On a far more serious note, when Molly complains that Yoda never tested Luke the way Harry's testing her, Harry ferociously chews her out with how he is not Yoda, and Real Life is not as forgiving of error as Star Wars.
Commenting on his past battles with evil forces, Harry admits he's not always sure where everyone around him falls on the Jedi-Sith Index.
Both Thomas and Harry start reciting "This is bad, this is bad, this is bad" during the battle at the docks, which could be a Shout-Out to Mr. Pink from Reservoir Dogs.
Harry refers to how Lash has been stoking his subconscious anger as "feeding my inner Hulk".
Justine tips Harry to the fact she's no longer a basket case by squeezing his hand in the "Shave And A Hair Cut" sequence.
Ramirez calls Vitto and Madrigal Beavis And Butthead before their duel, but Lara doesn't get the reference. A doubly-funny example for fans of that cartoon, as Vitto is obviously the Butthead and Madrigal, the Beavis.
Harry does, but he would have gone with Hekyll And Jekyll himself. Could be a double Shout-Out, if the spelling is a Jekyll & Hyde reference to White Court vamps' dual nature rather than just a misspelling.
Mae West is paraphrased again, this time by Elaine.
The description of a super-ghoul reassembling itself from spilled ichor is an obvious Homage to the T-1000 from Terminator 2: Judgement Day. Harry even describes the ichor moving "like liquid mercury", which is what the filmmakers used to shoot the scene in question.