I'm watching old episodes of Batman: The Animated Series on Amazon.com, and I notice several of them have, instead of the iconic B:TAS opening, an opening featuring Superman. Is there any difference in these episodes? Are they remastered or anything? Or is it just random choice on Amazon's part?
For example, on Amazon streaming, the pilot episode "On Leather Wings" had the opening featuring Superman, while the next episode, "Christmas with the Joker", had the one I expected. There were a few others with the opening featuring Superman as well, it seemed somewhat random.
ETA: This opening:
ETA 2: "Fear of Victory" had yet another opening, featuring Robin. I give up. Amazon Prime is bizarre.