Good catch! I’ll update the language on p. 12. I’m prepping an update with even more little tweaks and will include this among them.
As for the confusion w/r/t when saves apply, that’s there in the original. In general, with The Littlest Brown Book I’m trying to thread the needle between being faithful to 0e in all its glorious jank and providing something useful.
For Spell of Somonlence specifically, I don’t usually allow a save. Enough saves do specifically mention a save that it seems fair to say this one was intended not to allow it (and I like having it be pretty powerful). But it would be entirely reasonable to rule the opposite way. Another way to rule it would be that only characters with classes (PCs and leveled NPCs, but not bandits or hirelings) get a save.