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Samurai Jack VS Afro Samurai - S5-E9
Continuity mistake: After jumping right behind Jack, Afro attempts to stab him, and Jack avoids it. When Jack turns back to face Afro, it looks like there is a bit of distance between them, despite Afro being right behind Jack in the exact previous shot.
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)
Nightwing VS Daredevil (DC VS Marvel) - S5-E12
Trivia: This is the first ever Death Battle episode done in live action.