When at the school watching the singers you can see the actress who is later identified as Aunt Edie, sitting behind Frankie and Mike, but in the next shot she is missing, and then she returns.
When Frankie is on the road trying to get cell reception there is (CGI) corn on the left side, but one shot shows empty fields on the left side.
If you look at Frankie's drivers license in the pilot she is older younger than further mentioned.
In the final scene, when Frankie is riding in the convertible and then abandoned on the country road, the greenery in the side ditches of the road keeps changing. It goes from green on one side and bare dirt on the other to bare dirt on both sides and then full greenery on both sides, and back to bare dirt again.