And Winnie the Pooh sleepwear. Way to grind it in about her innocence, there, Jim...
Thomas recalls Mavra as having dressed like Hamlet's shrink at Bianca's party. Harry recites the "to be or not to be" line from Hamlet when Madge asks if he's an actor.
Fake Mavra's still dressed like Hamlet in the homeless shelter.
Lord Raith paraphrases Horatio's "flights of angels sing thee to thy rest" line, also from Hamlet.
Joan remarks that the film crew's misfortunes make it seem like someone said Macbeth, prompting Harry to mentally quote that play's three witches. Also counts as Foreshadowing, as there actually are three (ex-wife) witches to blame.
Arturo, far quicker on the uptake, takes only a moment to pick up on Harry's own round table quip.
Hinting that Murphy's not acting normal, Harry asks her where the aliens hid her pod. He's tempted to rag her further by singing Randy Newman's "Short People", but resists the urge.
Thomas claims that the Mafia "kiss of death" custom depicted in The Godfather was originally inspired by Lord Raith, who could make it literal.
Buffy the Vampire Slayer: Harry tells Inari to "make like Buffy" when they're surrounded by Black Court vampire lackeys.
Sliding on tiles, Harry muses that his boots were made for walking, paraphrasing Nancy Sinatra's signature pop single.
On a related note, his crediting Thomas for fending off a blampire with a "boot to the head" references the "Ti Kwan Leep" skit by the Canadian comedy troupe The Frantics: a classic staple for the Dr Demento show.
Black Court vampires are "fast, like Jackie Chan fast".
Held at gunpoint, Harry cites an anecdote about how Billy The Kid once missed his target at extremely close range, but opts not to push his luck.
Harry prepared his bear-head belt buckle for "in the words of Foghorn Leghorn, just such an emergency". Activating it made him feel like Ludwig van Beethoven's "Ode to Joy" was playing as his personal soundtrack.
The "Why are hot dogs sold in packages of ten but hot dog buns are sold in packages of eight?" question comes from Animaniacs; specifically, this is the Warner Brothers' "unanswerable" riddle for the all-knowing Wally Llama.
Jake quips that he looks like he shares a hairstylist with Einstein, Don King, and the Bride of Frankenstein after being electrocuted.
Kincaid in his combat gear looks like he's auditioning for a John Woo movie.
Kincaid gives Murphy a test of character straight out of The Untouchables, pushing her buttons just as Sean Connery did to Andy Garcia, culminating in a stand-off at gunpoint, followed by the line, "Oh, I like [her]."
Murphy snidely calls Harry's kick-in-the-door blampire-hunting strategy "making like the Flying Van Helsings". This is possibly a Take That to the Van Helsing movie, which came out three months before Blood Rites.
She apparently had get most of her Black Court knowledge from movies, as she confused Dracula's traits from films with those from the original novel.
Harry's remark about Mavra playing sock puppet with the omega Nosferatu is probably a reference to the 1922 silent film, as the "N" is capitalized. If Harry were just showing off that he knows the old Rumanian word for "vampire", it'd be lower-case and in italics.
Mike, Harry's mechanic, is an automotive Dr. Frankenstein. An especially-appropriate Shout Out, considering how the Blue Beetle is mostly patched together from bits of other Volkswagens by this point...
After a near-brush with death, Justine looks like the sort of terminally-ill child who'd be taken to Disneyland by the Make-A-Wish Foundation.