Continuity mistake: When Hades forms a chessboard to show Meg his plan, the chess-pieces on it change between shots.
Continuity mistake: After the frisbee is taken away from Hercule's, he sadly sits down on the edge of the fountain. Between shots the rocks and things on the ground distinctively change.
Continuity mistake: While watching today, I realized right before "Go The Distance' when Hercules' mother is putting the wrap on him, originally it's green, but throughout the song, it's blue. Part of me thinks that it's supposed to be the shadows from the sunset, but looking again, it seems that it suddenly changes from green to blue. Especially since during the lightning storm in the song the color doesn't change much at all.
Continuity mistake: Panic pulls open the tab on a soda can, but the can opens on the wrong side from the tab.
Continuity mistake: When the pillars are about to crash on the pot-maker, he has eight pots and his hand. Then after they don't, and he breathes in relief, there are only six pots in his hands.