D&D 5E Possible DM basic rules errata?

[Bumamgar]

The Acolyte is listed as a 1st-level spellcaster, but has 3 1st-level slots. How?

The other caster NPCs have the appropriate number of slots according to level and the PHB, including the Priest (5th-level caster, 4/3/2 slots) so it would appear that this is a mistake...

 

[mach1.9pants]

NPCs don't have to follow the same rules as PCs, so I don't think it is a mistake.