Kevin expects Simon to know about Batman & Robin despite having amnesia and isn't even a resident of Kevin's world.
When Simon walks off as a tour guide, the N on Kevin's jacket is missing.
When Simon speaks after exiting the warp and landing on the floor in the Palace, his coat is light blue rather than dark blue.
Lana: What do you see in the mirror?
Simon: You mean I'm a Prince Charming?
Lana: No, Simon! I mean you're an arrogant, self-centered egomaniac!
Simon: I'm that good, am I?
Episode released on DVD titled: Captain N The Game Master The Complete Series.
Simon's supposedly being Donkey Kong Jr:
A reference to Donkey Kong's actual son who debuted in and was the main character of Donkey Kong Jr.