Bah! Just jot down relevant details. No one needs to know that the critter has +37 to Climb if that skill is not going to come into play. No one cares if the HP or saves or AC aren't strictly correct.
As for what I most hated from edition to edition?
1E - Tables.
2E - Bards being better wizards than wizards.
3E - The creeping addition of types. It went from KISS to bloat. Fortunately it was possible to keep them in check by classifying many as the same family (e.g. Holy, Sacred, Blessed, Good, Axiomatic, etc all = Divine) so they didn't stack.
4E - Didn't play but AEDU.
5E - That Fighters as written aren't actually better fighters than other fighting classes until 11th level unless you mandate that Action Surge is combat-only.
Overall: the creeping bloat of races with the concomitant encouragement of the menagerie.