While less likely, that one could also be a reference to Terry Pratchett's The Carpet People, where a skilled fighter who is nonetheless clueless with swords is told "The blunt end goes in your hand and the sharp end goes in the other person... don't get them mixed up."
Or "The Mask of Zorro", where Murrieta says "The pointy end goes into the other man."
Scapegrace, as a zombie head in a jar, notes that he had heard someone once say fezzes were cool.
Ghastly giving relationship advice to Fletcher in the chapter 'The Wisdom of Leonard Cohen'. He quotes I'm Your Man, saying it's something a friend of his once said.
In The Maleficent Seven, Tanith and Sanguine mention that they are both Harry Potter fans while ridiculing a Necromancer who uses an actual wand for magic. They're worried it might become a stereotype.
In the same book, Tanith quotes The Untouchables and is rather annoyed when nobody else gets the reference.
Another in The Maleficent Seven, Saracen Rue knows stuff.
"I watch things now. Shows. Gilmore Girls. Have you seen it? I watch the reruns on television. They talk so fast on that show. I've never known anyone to talk so fast, except on The West Wing. The Wire. I've watched that as well. Harrowing stuff, but I watched it. And Buffy the Vampire Slayer. Now there was a show. Firefly, too. Cancelled before its time, that one."