Corrected entry: In the first episode ("Beast Wars, Part One"), Waspinator has the ability to spit some kind of laser beam from his mouth as he fires on Cheetor. But for some reason he never uses it again for the rest of the series.
In "Deep Metal" (Season 3), Depth Charge fights Rampage on the beach. Throughout the whole episode, Depth Charge has four fingers. But in a shot when DC doubles over in pain to clutch his wounds, he has five fingers.