Iron Man (1994)

During the opening credits theme while Tony Stark is at the anvil "creating" his armor when he strikes with the hammer you can see flashes of Iron Man's previous armors, including the original gray Mark I and the Silver Centurion armor

First appearance of Nick Fury.

Tony's spinal injury from the first season seems to have been retconned and turned into the heart problems he suffers from the comics.

First Appearence of HOMER.

Final appearence of Fin Fang Foom, presumably destroyed along with the other dragons and their gateway.

Hipnotia ,Blizzard ,Whirlwind and Blacklash are the only Mandarin's thugs who left in his service because the other's were presumably arrested.

An explosion scatters the Mandarin's rings across the globe and leaves him powerless. He spends most of the second season retrieving each of his rings, leaving Iron Man to face new opponents on a frequent basis.

Force Works disbands upon learning that Stark deceived even them in faking his own death to lay a trap for the Dragons (they would frequently guest star in later episodes of the season). Only Spider-Woman and War Machine remain at Stark's side.