Continuity: Near the end when they are about to do battle with BloodClan, Firestar meets Whitestorm's "worried blue eyes" eyes. In the first book they are "the color of sunbaked sand". Cat eyes don't change colour.

Continuity: When Graystripe and Firestar spy on the Tigerclan camp they name the cats in the clearing. Mudfur is among them but on the next page it mentions a lack of medicine cats. Mudfur is the medicine cat. As far as I know you can't unbecome a medicine cat.