The Crypt Keeper was Rod Serling Back from the Dead.After he quit the Night Gallery and long after he was done taking people into the Twilight Zone, Rod Serling moved into a creepy old mansion upon a hill, he died and decided to continue telling creepy stories even after his own death in the crypt... way down below his house. Due to the location, he took up the moniker of "The Crypt Keeper". But for this to be true, you would have to ignore the Crypt episode, "Lower Berth".
The Cryptkeeper is the same one from the Amicus movie of the 70's.It's entirely possible that after a few decades of being an undead, his mind began to rot a little bit. His personality change could also be explained away by the fact that his brain is rotting too, so he's gone a little funny. For this you would have to ignore Lower Berth again.
The Crypt Keeper plays on the tire swing hanging from the tree in his yard, when he is bored!Why else would he have it there?
The stories were all true, but they don't happen until the Crypt Keeper tells them to us.In that way, he actually makes the stories reality. Thus making ol' Crypty a type of god.
Miguel Ferrer's character from As Ye Sow is the same guy from The Thing From The Grave.Assuming that As Ye Sow happens first chronologically, it makes perfect sense that his assassin character from that episode would later start dating Terri Hatcher's character from The Thing From The Grave. His past as a killer would explain why he was so psycho in the latter episode and why he was so good at killing.
The Cryptkeeper's father's condition explains the Cryptkeeper's obvious preoccupation with Siamese twins. According to the end framing segment of "Lower Berth," the Cryptkeeper's father had two faces, which is generally only seen in conjoined twins. This is the reason why the Cryptkeeper chooses to tell so many stories that involve conjoined twins.
The protagonists in the stories were the corpses in the Cryptkeeper's crypt.The stories explain who they were and usually how they died.
The Cryptkeeper wants the audience to delight in the deaths of the protagonists as much as he does.To this end, he deliberately portrays the protagonists unsympathetically so the audience will perceive their ultimate fate as deserved.
Nelson Halliwell from Leading Role is an alias of Gomez Addams.Same actor, same personality. At some point he and his family were committed in different asylums.
The Cryptkeeper is not the Cryptkeeper.The owners of that house coincidentally collected Tales from the Crypt comics. After they died, a ghoul haunting the tombs below raided the house, fell in love with the comics, and started pretending he was the presenter of the stories.