It has Vicious Mockery listed in the Bard's list of cantrips, and that spell was not present in 5.0. (I don't know which book that spell was originally in).
SRD 5.0 has appendices starting after the spells, but 5.1 has various other sections, starting with Traps. Everything from the spells onwards will have different page numbers, so any "source references" (in things like VTTs) will need to change,
Has anyone done a complete analysis of changes yet?
New Spells
There are 5 additional pages of spells. The following new spells are taken from the spells listed for each class.
Cantrip - Vicious Mockery, Spare the Dying, Druidcraft, Poison Spray, Fire Bolt, Eldritch Blast
SRD 5.1 has 5 more pages than 5.0
It has Vicious Mockery listed in the Bard's list of cantrips, and that spell was not present in 5.0. (I don't know which book that spell was originally in).
SRD 5.0 has appendices starting after the spells, but 5.1 has various other sections, starting with Traps. Everything from the spells onwards will have different page numbers, so any "source references" (in things like VTTs) will need to change,
Has anyone done a complete analysis of changes yet?
New Spells
There are 5 additional pages of spells. The following new spells are taken from the spells listed for each class.
Cantrip - Vicious Mockery, Spare the Dying, Druidcraft, Poison Spray, Fire Bolt, Eldritch Blast
1st level - Animal Friendship, Goodberry, Hunter's Mark, Hellish Rebuke, Find Familiar
3rd level - Compulsion, Branding Smite, Counterspell
4th level - Guardian of Faith
(Some of these spells were referenced by Feats or Monsters in 5.0, but they didn't actually appear in the spell list.)
I suppose, since 5.1 is 7ish years old. See https://dnd.wizards.com/resources/systems-reference-document for example
That might explain it!.
I had a local copy of 5.0 from 2016. I never checked for a newer version.