The Alien Costume: Part 1 - S1-E8
Audio problem: When John Jameson is inside the crater, his mouth is not moving for any of his dialogue. He's communicating with the other astronaut, so it can't be an inner monologue. (00:01:05)
The Alien Costume: Part 1 - S1-E8
Audio problem: When Eddie Brock is complaining about being stuck in traffic, he hits both of his fists against the handle of his car's steering wheel and somehow the horn blows. (00:03:00)
The Alien Costume: Part 1 - S1-E8
Audio problem: When the field reporter is saying "The shuttle is headed for the greater metropolitan area," his mouth movement does not match the word "metropolitan." (00:04:15)
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
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 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 11: Tablet of Time - S2-E9
Audio problem: When Smythe is saying "Now I've got you!", his mouth movement does not match the words whatsoever. He even opens and closes his mouth several times on the word "now" alone.
Partners in Danger Chapter 5: Partners - S4-E5
Audio problem: When Vulture asks Scorpion to turn the TV back on, his mouth isn't moving.
Partners in Danger Chapter 8: The Return of the Green Goblin - S4-E8
Audio problem: When Spider-Man is web-slinging at the end with Harry in tow, the sound of his web shooters is not in sync with the webs firing.
The Wedding - S5-E1
Audio problem: When J. Jonah Jameson is telling Peter he can work off his wedding gift over the next decade or two, his mouth movement is slightly out of sync with the dialogue.
The Wedding - S5-E1
Audio problem: When the orderly is telling Harry that he has visitors, his mouth isn't moving.
Six Forgotten Warriors Chapter 3: Secrets of the Six - S5-E4
Audio problem: When Kingpin is asking Scorpion if he is the traitor, his mouth movement is not in sync with the dialogue.
Six Forgotten Warriors Chapter 4: The Six Fight Again - S5-E5
Audio problem: When Dr. Groitzig is saying "It's been so many years," he has his fingers in his mouth. While it's possible to speak with fingers in your mouth, your voice will sound quite different when doing so, and Groitzig's voice sounds normal.
Secret Wars, Chapter 3: Doom - S5-E11
Audio problem: When the Lizard says "Yes, Spider-Man," his mouth is wide open and motionless.
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.