Mario VS Sonic (Nintendo VS Sega) - S5-E13
Continuity mistake: Mario's gloves and hands get skinned up by Sonic's spin attack during the free fall. And when Sonic's severed foot lands in Mario's hands, the damage is visible. But in the next shot when he starts jumping for joy, holding the foot, his hands are visible and his gloves suddenly look spotless and brand new. (00:18:05)
Black Widow VS Widowmaker (Marvel VS Overwatch) - S6-E3
Factual error: When Black Widow and Widowmaker fire the sniper shot at each other, there is a close up of the bullets grazing each other in mid air. However in this shot the bullets are animated as having the casings still attached while flying through the air. (00:15:30)
Ghost Rider VS Lobo (Marvel VS DC) - S6-E10
Audio problem: When Ghost Rider drives up and points at Lobo, he starts speaking. His mouth is moving, but when it cuts to a different angle just before Lobo runs him over, his mouth is now not moving while he's still speaking.
She-Ra VS Wonder Woman (He-Man VS DC) - S7-E10
Continuity mistake: In the intro when Boomstick is explaining She-Ra's sword, he mentions it's ability to freeze. After this it cuts to a close up of Wiz and suddenly he is further away from their TV with more of his desk and station positioned to his right, our left. (00:02:50)