Spells that need target change:
BBoD: target creature.
Stone to flesh target placeable.
Death domain needs target creature.
Spells that need spoken/somatic component adjusted:
Spells that need meta-magic added:
Heal and harm need empower and maximize.
Any wrong harmful/beneficial flags or other problems you hear about (I think something refs a subradial that doesn't exist, big problem if game assigns an NPC to perform).
QoL of life might be just to have any spell take any metamagic for more options for memorizing/using spells.