Excerpted from a February 12, 2008 interview with Naveen Andrews:

What did you think of the shock twist at the end of season three?
"I can't remember it actually. What happened? Oh God yeah, the main one. I guess it put the frighteners on the cast because everyone started thinking 'if people are getting off the island, will I be one of them?' I think that's what most people were concerned with, quite frankly."

And are you missing Dominic Monaghan on set?
"Yes. I've got no-one to do Alan Partridge with now, so it's a sad loss."

http://www.digitalspy.co.uk/cult/a89120/naveen-andrews-lost.html