Corrected entry: From the scene where Heddy takes Allie to the fancy salon, and Heddy freaks out Allie by getting her long brown hair cut short and dyed red to match Allie's. Allie gets a trim on her normal short cut, but just as she's finishing, Heddy comes out with her whole transformation - one that would take much longer than Allie's short trim did.
Ral0618
18th Apr 2010
Correction: Not really a mistake since we don't know how busy the salon was, and it's very possible that Allie wasn't taken care of until much after Heddy, as shown.
Ral0618