There is a scene where Hercules is being painted on the side of a vase or something. Hercules is wearing a lionskin - when he throws the lionskin down, if you look carefully, you can see that the lionskin is made out of Scar, from the Lion King.

Greek mythology has a Philoctetes. He is however not a sartyr who trained heroes, he is a human who gets bitten by a snake en route to Troy. Because of the stench from the wound he is left behind and Odysseus returns to pick him up towards the end of the war.

In ancient Greece the definition of a hero was actually someone who was half human, half god, so Hercules really is a true hero.

As already noted, Hercules wears a lionskin which is made out of Scar. In the myths of Hercules one of his great tasks was to kill a vicious lions and he kept the skin ever since. But it's more than just a joke or a cameo that he wears Scar, for both Scar and Hercules were animated by the same man (Andreas Deja).

During Meg's song, there is a shot with the Muses as five singing busts in a row, with the second one from the left broken. This is exactly the same as the singing busts in the Haunted Mansion at any Disneyland.