Helping Hands, Iron Fist - S1-E4
Revealing mistake: When Iron Man appears on the screen in the Hulkbuster armor, if you look at the background behind him, there is a closed door behind him to his right and a control panel directly behind him, which means he appeared from out of nowhere.
Revealing mistake: When the Hulk is sitting on the edge of a building, Talbot suddenly appears in a helicopter to ambush him. If you watch closely, you can see the helicopter originates from behind Hulk instead of rising up from behind the building.
Man to Man, Beast to Beast - S1-E6
Revealing mistake: When Hulk uppercuts Sasquatch into the ice wall, if you look closely you can see that Hulk's fist doesn't even make contact with Sasquatch.
Revealing mistake: When Hulk jumps out of the river towards the New York skyline, he disappears into thin air.
Revealing mistake: When the Gamma Warriors are running towards Hulk on the rooftop, you can see two creases going vertically across the screen, likely from the edges of the animation cells. (00:20:18)
Answer: I believe it was mentioned in an issue of Wizard Magazine that the show was cancelled because of low ratings, and reportedly the show's creative shift in the second season had a part to play in the low ratings, as the changes alienated fans.
Phaneron ★