Thor vs. Wonder Woman - S4-E13
Continuity mistake: Thor goes from having the Warrior Madness and getting hit once with Mjolnir to being on his knees without the Warrior Madness, all within a single edit without ever cutting away from Thor in between the two shots.
Other mistake: When Shao Kahn rips M. Bison in half, M. Bison's hand is ripped apart too... and then stays attached to his body somehow.
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.