Continuity mistake: Patti sings terribly in this episode. But in "Doug's No Dummy", she could sing perfectly.
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Suggested correction: While it is shocking, one thing to consider is Patti is going through puberty. It's not just boys who need to relearn how to sing with puberty and can go from canaries to frogs; girls do too. Especially if they have not had proper training, and are aiming for notes they can no longer hit. Patti's at the right age. She may be going through the same thing.
