He told TV Squad that 'The New Man In Charge' will explore new aspects of the Lost mythology.
"There's a couple of procedural mysteries that get cleared up [in the epilogue] I think, and I was happy to have that," he explained. "The writers weren't dealing with procedural mysteries in the finale. They were bringing the show to kind of a spiritual conclusion, and that was the right emphasis I think."
He added: "I'd have to say that this DVD extra feature thing is lighter-spirited and a little more mechanical in the best sense of that word. And we do have the satisfaction of seeing what happened to some of the people whose storylines were not resolved in the finale."
Emerson confirmed that the scene will give fans "a little taste" of what life on the island was like under Hurley and Ben's leadership.
"The finale leaves open that great dark gap of time when Hurley and Ben make their agreement to become the management of the island," he said. "Between that and the afterlife, what happened? What happened for the hundreds, thousands of years during which they were in charge? That's all a complete blank, but we do get a little peek at that world in this DVD extra feature."
The final season of Lost will be released on DVD and Blu-ray on September 13.