If you've noticed any characters appearing and disappearing, it isn't because the artist is lazy, it is because an evil demon is deceiving you.
Ancient Greek Office
They all laughed, but Thales's bottled water company went on to become a billion dollar empire.
Hypatia of Alexandria and the Seven Presocratics
Later on, Socrates forgot that he poisoned the apple, and ate it himself. Plato had to make up this whole story about an apology, because it was just too embarrassing.