Transylvanian Homesick Blues - S2-E65
Character mistake: Ray says that it's the very first time they've dealt with vampires. In Season 2 Episode 25, "No One Comes to Lupusville", the Ghostbusters had to deal with both werewolves and vampires.
Shito! Kyofu no kokushiken - S1-E11
Character mistake: Kiki says "Oh! He stopped bleeding" when he is in fact still bleeding from the other wrist. (00:10:35)