Episode 4.05: The Constant (Desmond-centric)
Airdate: February 28, 2008

* 02/12 - Sayid and Desmond hit a bit of turbulence on the way to the freighter, which causes Desmond to experience some unexpected side effects. Guest starring are Jeremy Davies as Daniel Faraday, Rebecca Mader as Charlotte, Jeff Fahey as Frank Lapidus, Alan Dale as Charles Widmore, Sonya Walger as Penelope "Penny" Widmore, Graham McTavish as sergeant, Darren Keefe as Billy, Edward Conery as auctioneer, Marc Vann as doctor, Fisher Stevens as George Minkowski, Kevin Durand as Keamy and Anthony Azizi as Omar. Source: ABC
* 01/19 - Even though episode 5 is a Desmond episode, one of the boaties, Jeremy Davies, appears in the episode as a professor of physics at Oxford. Source: DocArzt's Lost Blog
* 10/02 - RAY: 40s-50s, any ethnicity, psychiatrist, cold, professional type who can do what's necessary to get the job done. ALFRED: 40s-50s, Caucasian, British, cool and calm under pressure, knows his place in society and knows how to handle members of the upper classes. BANNERMAN: Mid 40s, any ethnicity, narcoleptic, can fall asleep at the drop of a hat, but has an important piece of information to tell. A very smart technician by trade. BILLY: Mid to late 20s, Caucasian, British, a good buddy to have, willingly to listen but won't take too much gruff before he'll knock you in line. FOLEY: 40s - 50s, any ethnicity, British, physically fit, tough task master, unrelenting. A performance reminiscent of R. Lee Ermey in "Full Metal Jacket". LARSON: Late 20s - 30s, any ethnicity, smart, dangerous but capable of charm and humor. Tough military type. Follows orders and doesn't question them. Possible recurring character. KEAMY: Late 20s - 30s, any ethnicity, dangerous, physical - a great tactician, loyal friend and the last enemy you ever want. Military type. Follows orders and doesn't question them. Possible recurring character. Source: Lost Spoilers
* 10/02 - 4.05 could be Desmond-centric. Lost of British soldier types. Also in the episode and possibly recurring, Ray, a coldly professional psychiatrist. Source: secretagentman @ TWoP

Desmond has "unexpected side effects" when the helicopter has "turbulence" on its way to the freighter?

Time vortex? We've seen that he's somehow more "plugged in" or suseptible to alternate timelines and/or time travel than the others. It'd be interesting if he starts bouncing between realities in front of the other passengers.

Ep. 6 - Juliet
Ep. 7 - Juliet and Sun
Ep. 8 - Michael

Flash forward for Sun? but she's supposed to be dead in the future, isn't she?

flash forward for Juliet AND Sun. It could be a flash forward on the island. Is there a rumor that Sun dies after the baby is born?

Where'd you get that from? Even if she wasn't one of the six, that doesn't mean dead.

That sure looked like the Numbers guy that was in the mental ward with Hurley

Time trippin ftw.