Other mistake: When the three fairies are cleaning up the cottage, Merriwether has the broom magically sweep all the dust into a pile, then she makes the pile disappear. Right after it does so, the picture is stuck in a freeze-frame for about half a second.
Other mistake: Aurora is celebrating her sixteenth birthday but there are only 14 candles on her birthday cake.
Other mistake: Flora's magic is pink. But her attire is red. So her magic should be red too.
Answer: Because she wasn't paying any attention to the color.
Disney-Freak