I also find it interesting how most of these locations were wrong on both spec maps even though 8/10 eventual houses appeared on the second one:
Bugs was assumed to be a soundstage on both when it ended up being a sprung tent
Chupacabra went from a sprung tent to the F&F tent when it was a soundstage
Halloween was assumed for a parade building until much later in the spec season when a soundstage entered the realm of possibility, swapping with Monsters
The Weeknd was always in a parade building, just not the eventual one
Dead Mean's Pier, Descendants of Destruction, and *somewhat* Blumhouse since the F&F tent replaced the MIB tent were the only correct locations from the first two spec maps.