The pentacle is a five-pointed star inscribed in a circle. It is a symbol of the Wiccan religion, whose practitioners refer to themselves as witches. The custody trial has had many counterparts in real life in which single parents, usually women, have their beliefs held as grounds for denying custody of their children.
The mystery of Ginny's disappearance is finally solved, but after seeing how close she was to the rest of the regular characters during the first two seasons, why then do none of them (save Carter and maybe Oslo) seem upset at Ginny's death? As such, the whole thing seems a bit flat.
At the funeral, Ginny's brother sings "The Rainbow Connection" from The Muppet Movie.