Sins of the Fathers Chapter 3: Attack of the Octobot - S3-E3
Continuity mistake: When Doc Ock is about to unmask Spider-Man in his lab, there is a brief shot of Doc Ock standing under a night sky. This is from their rooftop battle in the previous scene/episode.
Silence My Companion, My Death Destination - S1-E4
Continuity mistake: When the general is putting his sunglasses on, they resemble safety goggles. When the shot changes, they look more like aviators. (00:01:50)
The Silver Surfer & the Coming of Galactus: Part 1 - S1-E5
Continuity mistake: When the Four are looking out the window and observing the burning sky, Reed is incorrectly depicted with blonde hair. When the shot changes, his hair is back to being brown, but now the white streaks in his hair are also brown. (00:05:18)