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.
More mistakes in Death Battle
Nightwing VS Daredevil (DC VS Marvel) - S5-E12
Nightwing: Hah, see you in Hell. (00:17:40)
Trivia: This was the first episode of the show with actual voice acting.