Towards the end of the movie, when Mister gives the box of memorabilia to Celie, one of the things in the box is Nettie's straw hat. But earlier in the movie Nettie is seeing wearing the straw hat while she is in Africa.
At least two scenes take place in a Baptist church. Behind the pulpit is a Roman Catholic cross with a Corpus (body of Jesus). Baptists, like all other Protestants, never place a Corpus on the cross.
With the Gramaphone, the Reproducer, that holds the needle, is on the wrong side of the record and in reality would not work.