The girls point the way Mama P went with Jakes bike but in the next scene their arms are by their sides.
The first pluot was announced in 1990, so there couldn't have been a Pluot Festival in 1965. (For what it's worth, the "pluots" in the show seem to be plumcots, anyway, which are a much older hybrid, 50/50 first-generation crosses between plums and apricots, rather than the 60/40 long-bred crosses that are pluots.)
When the girls bake the last ditch layer cake, it breaks all curses. Including Chuck's curse. They said it broke all curses. The girls did not know Chuck. So when his curse broke, Jill's curse (season 3) should have also broken, even though they didn't know her. So this is a bit counter-magical.
Hannah and Darbie did not eat any of the Candies Stone Fruit, so they did not need to drink the Protection shake and could have let Jake have one instead of drinking it themselves.