Plot hole: When Tinkerbell tries to find Gruff in winter, she's seen flying with her wings out of her coat; in a later scene, Fawn flies too. After Tink finds Gruff, her wings disappear from underneath her coat. This is a plothole because of how the whole storyline of Secret of the Wings was that warm fairies can't fly in winter weather or their wings will tear.
Suggested correction: Yeah but at the end of Secret of the Wings, they find a way to let any fairy fly in winter.