Continuity mistake: Kraven's arm band that he wears on his upper right arm switches to his left one briefly after he fights Spider-Man for the first time.
The Menace of Mysterio - S1-E5
Continuity mistake: Mysterio sounds cold and calculating in this episode. Yet in later ones he sounds different despite being voiced by the same actor.
The Sting of the Scorpion - S1-E6
Continuity mistake: The Scorpion gets bigger here, his eyes turn yellow, he gets fangs, his skin becomes sickly looking, and his fingertips resemble claws. Yet later on in later episodes he's missing all of that.
Doctor Octopus: Armed and Dangerous - S1-E4
Continuity mistake: Doc Ock's left glove briefly disappears during his second fight with Spider-Man, and Jameson's pants are briefly his jacket's color during that fight.
The Menace of Mysterio - S1-E5
Continuity mistake: When Mysterio's unconscious he's in his costume. When Spider-Man leaves him webbed up he's wearing street clothes. But when he's shown on the headlines of the Daily Bugle he's back in his Mysterio costume.
Continuity mistake: When Peter and Debra are approaching Dr. Connors' office, the nameplate on his door misspells his name as "DR. CURT CONNeRS". After they have entered the lab, the nameplate is shown to have the correct spelling. (00:06:10)
Answer: In the comics, Hobgoblin's true identity was kept a mystery for a long time intentionally and while many fans deduced it was Kingsley, and creator Roger Stern was leaning that way, Stern left the series in 1984. In 1987 Hobgoblin's identity was revealed to be Ned Leeds and then Macendale became Hobgoblin. It wasn't until 1997 that Sterns wrote the mini-series "Hobgoblin Lives" and retconned Kingsley as the original Hobgoblin.
Bishop73