This episode it supposed to be 6 months into the future from the previous episode, yet Wyatt looks the same and has not grown.
The students' names in the yearbook listings are not in alphabetical order like they should be.
The girls didn't get their powers until after high school, so past Phoebe shouldn't be able to cast spells yet.
There are framed photos of Phoebe as a teenager all around the manor, and in them she has her natural fine light brown hair. Yet when Phoebe transforms into her younger self, she has thick dark brown hair that matches her adult dye job.
Phoebe still has her nose ring after she transforms into her past self.