Bobby's Mother Invoking 'Tetragrammation'
That is a major goof on the part of the writers. You see "Tetragrammation" is one of the ancient names of God. For instance, Yahweh, Jehova, I AM, etc.
Watching "Bobby" leads one to believe that he is some sort of demon or prince of the underworld when Lysette Anthony's character holds the ritual and invokes his name. It's a goof/plot hole of course because as I've stated, that's a name of the Christian God, and you would have no business getting him to raise up a spirit back to life, bring back the dead, etc. You certainly wouldn't get God to act by holding a occult ritual which is forbidden in Christian religion. God is not going to release anybody from Hell for that matter, so that's poor research on the writers part. Just saying.