Character mistake: Another identity mistake in the finale: When Beast Boy's team is initially subdued, we see honorary Titan Hot Spot standing amongst the villains even though he is a) a hero and b) is supposed to be frozen solid at that time.
The Devil Made Me Do It - S1-E8
Character mistake: In his discussion with Joan about the belief that the devil sometimes disguises himself as God, Father Ken calls the Book of Revelation "Revelations."