Innervisions - S1-E7
Continuity mistake: When Silver Surfer is heading towards the temple to turn off the Dreamweaver, Beta Ray Bill throws his hammer at his back, which knocks Silver Surfer off his board and into the ground. When Silver Surfer rises out of the hole in the ground, he does so perched upon his board, even though it should be on the ground behind him.
Buttercrush / Fuzzy Logic - S1-E4
Continuity mistake: When Buttercup punches a hole in the wall to see her sisters are being lowered into lava, the hole's initially quite small. In the next shot, the hole is noticeably bigger.