Continuity: "Amanda's" hair is back to its same length (and style) when Walter visits "her" in the psychiatric hospital as it was before "she" had the barber cut it. While "she" does say "she" has been there for five months, and apparently five or six months have transpired from the time of the trial, there is no way the hair would have grown from above the ears to down below the shoulders in six months - hair grows about 1/2 inch per month, so it would be about 3 inches longer than before. The hair should have only been slightly longer to show that amount of time has passed.
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