Mewtwo VS Shadow the Hedgehog - S3-E6
Revealing mistake: During Shadow's Super Shadow transformation, half of the background becomes a green screen.
Death Battle (2010)
1 revealing mistake in Mewtwo VS Shadow the Hedgehog - chronological order
Starring: Chad James, Ben Singer
Starscream VS Rainbow Dash - S1-E17
Continuity mistake: Rainbow Dash catches Star Scream in a tornado and spins him around so fast in his jet form that you see one of his wings break off and fall away. He plummets to the ground and transforms into his robot form and begins to beg for his life. He suddenly has both wings again at this point.
Nightwing VS Daredevil (DC VS Marvel) - S5-E12
Daredevil: I wish I could see the look on your face.
Nightwing: Me too. (00:17:15)
Trivia: When Scorpion catches Ryu's fist, we get the first 2 hand-drawn shots in the history of the show. (00:12:00)