This is late in the game, but Expo, it just looks traced with minor changes or omission of certain details.
I have seen other artwork be rejected on similar grounds and not be as similar.
As far as the difference of the hot dog to the mayan...parody. Taking a part of pop culture and making a parody of it is a common thing on Woot: one, two, three. Your design is not a parody of the lid. It is the lid.
Regardless, it did quite well in the derby. In fact all your designs did. Good luck in the next one.