Wyrd Sisters is one of those books that I look back on and wonder how much Pratchett had planned out beforehand. It's so intricate and interwoven. The slips of non-prophecy prophecy are just great.
We also start to get hints about the power of stories on the Disc. This will come back in Witches Abroad.
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Mentioned in this book:
"A Wizard's Staff Has a Knob on the End"
"The Hedgehog Song"
Ankh-Morpork
Black Aliss
Blind Io
Boggis
Cabbage
Chrysoprase the Troll
Death
Dwarf bars
Dwarven song "Gold, Gold, Gold"
Eldritch means Oblong
Grabpot Thundergust the Dwarf
Grabpot Thundergust the Dwarf
Granny Weatherwax
Greebo
Headology
Herne the Hunted
Hoki
Hwel, Tomjon, and Vittoler's men - The Dysk
Lancre
Leonard of Quirm
Magrat Garlick
Nanny Ogg
Old Poorchick and his cow
Standing Stone(s)
The Assassin's Guild
The Fool/Verence II
The Fool's Guild
The Forest of Skund
The Librarian
The Mended Drum
The Ramptops
The Thieves' GuildThe Vampire Queen of Lancre