Neogenic Nightmare Chapter 8: Duel of the Hunters - S2-E8
Other mistake: After falling down the cliff and getting blasted back by his van's explosion, the Punisher shows no signs of injury. This kind of fall combined with explosion should have killed him, or at least injure him very severely, as he is a normal human without any superpowers.
Neogenic Nightmare Chapter 5: Mutants Revenge - S2-E5
Continuity mistake: When Gambit waves to Beast after catching Genevieve, his gloves are missing. (00:16:55)
Neogenic Nightmare Chapter 5: Mutants Revenge - S2-E5
Audio problem: When Wolverine says "I'm tired of being diplomatic," his mouth is closed for the word "being." (00:02:00)
Neogenic Nightmare Chapter 4: The Mutant Agenda - S2-E4
Audio problem: When Hobgoblin says "I don't want to hurt him," his mouth stays open at the end of the line. It's not possible to say "him" without pressing your lips together. (00:17:40)
Neogenic Nightmare Chapter 4: The Mutant Agenda - S2-E4
Audio problem: When Spider-Man is saying to Beast "I'm not sure I still am," Beast is the one mouthing the last three words in the line. (00:09:25)
Neogenic Nightmare Chapter 4: The Mutant Agenda - S2-E4
Continuity mistake: When Professor X is explaining his line of work to Spider-Man, the neck portion of Gambit's headgear is flesh-colored. (00:04:35)
Neogenic Nightmare Chapter 4: The Mutant Agenda - S2-E4
Continuity mistake: When the X-Men are approaching Spider-Man, the neck portion of Gambit's headgear is flesh-colored. (00:01:45)
Answer: Yes. Many things that would have been in the sixth season would have had Norman Osborne returning from limbo and reclaiming the title of the Green Goblin, Richard Fisk, the son of "The Kingpin" Wilson Fisk would return as a crime lord known as "The Rose", Ghost Rider would have appeared to help Spider-Man stop Dormammu from returning to Earth and Madame Web and Spider-Man would rescue Mary Jane from limbo.