I find it interesting that Moses and Elijah were fully alive and conversant and obviously "in the know" regarding Jesus and his work on earth. I think it is very unlikely that they were the only two people ever in heaven to be made aware of events on earth while the rest of those in heaven maintained a blissful naivete regarding events on earth. So Peter, James and John saw "dead" people who were fully alive and able to hear and be involved in God's plans on earth.
What I find surprising is that Peter, usually being rather quick to speak, didn't chide Jesus for going against the scriptural prohibition on consulting with dead spirits (necromancy). (Deuteronomy 18:10-12; 1 Samuel 28:3-20; 2 Chronicles 10:13, 14; Isaiah 8:19-22) Certainly those verses don't apply here. Neither do they apply when we pray (ask) to people in heaven, who are alive and "in the know" to intercede for us.
"HE IS NOT THE GOD OF THE DEAD, BUT OF THE LIVING. YOU THEREFORE DO GREATLY ERR."
Origin: modern-wiccan.blogspot.com