'Lost' producer: finale has new sets, questions

"Lost" co-creator Damon Lindelof tells THR the crew built new sets for the final moments of the ABC hit drama and that fans should expect to ask themselves, "What did they mean by this?" after the show ends. 

"We did not shoot the final scene of the series on the final day ... for reasons of maintaining the secrecy of the show, and we had to build some sets for the finale -- the construction of the new sets took awhile so that's the work that we did last," Lindelof said.

Lindelof said he understands why some fans have been frustrated with the final season's "flash sideways" device, and promised that it will be explained.

"We knew the new storytelling device would be controversial," Lindelof said. "We started showing people this thing, and people don't know what it is. They don't know how it connects back in the show. We're throwing this huge mystery into a show that already has a bunch of mysteries at a time when the audience expects us to be closing doors and not opening them."

The producer also brushed off speculation about Desmond being absent from the show's final cast photo.

"A cast photo that includes some characters but not others is beyond our area of involvement," Lindelof said.

As for the nagging question of whether fans be satisfied by the ending, Lindelof said the finale will not employ a "Sopranos"-style fake-out, but he emphasized that viewers will definitely be left with questions.

" 'The Sopranos' ending only worked on 'The Sopranos,' " Lindelof said. "The series finale has to fit the show. We're trying to end lost in a way that feels 'Lost'-ian and fair and will generate a tremendous amount of theorizing. We're going to be as definitive as we can be and say this is our ending, but there's no way to end the show where the fans aren't going to say, 'What did they mean by this?' Which is why we're not going to explain it."

Here's Matt Belloni's full interview with Lindelof: