Mary and Freddy lived the rest of eternity together in Halloween, helping kids go back and have wonderful lives in the living world. They also had a few kids of there own. Mack, Danny, and Glenda.
And I can say that Jack and Sally were thrilled when they heard they were going to be grandparents. The boys were also amazed to be uncles, and got to learn all about how to take care of children before having ones of their own with some witches that had arrived soon after Freddy had returned. And overall they lived happily ever after in Halloween.
"The end."

"There finally asleep."

"I know aren't they cute."

"Definitely worth the wait."

"Definitely."

"I'll never forget that day."

"I'll never forget either."

"Love you, Freddie."

"Love you too, Mary."