Is there some lore that Butcher got fundamentally wrong?

Just out of curiosity, from the many world lores that Butcher picked for his story, did he get one myth outside of its actual origins?

For example (Butcher did not do this), in some stories Hades is made equivalent to Satan/Hell. But Hades the god is not a Satan-equivalent and Hades the place, only the Tartarus part could be compared to Hell.