There are a few things that don't add up:
1. The doctor told Syd that Vaughn just came out of surgery and should be in recovery for a while and when Sydney walks in the room, Vaughn is wide awake.
2. Jack is on the phone with Weiss and Marshall with a plan to extract Vaughn. Jack says that as soon as Vaughn is "well enough" they will take him to safer location. Never was there mention that Sydney would go along with him or should know about it.
3. The drink: She gives him something to drink, says goodbye and then a few seconds later, he says he his tired and then...he flat lines and Syndey is pushed outside the hospital door. this is a CIA hospital and Jack is the new Director...so that could mean that Jack plan the extraction with or without Sydney's knowledge.
something must have been slipped in his drink. (just like they did to the guy at the party earlier in the episode. the champagne glass....the guy drank it and collapsed.)
4. Sydney and Jack's reaction to it all. No hugs between father and daughter...just weird looks that speak volume.
5. the closed casket. You think they would show Vaughn's face, so that we know for sure that he's dead and Sydney's reaction as she looked at the casket was kinda of odd.
6. Sydney waited 6 months after "Vaughn's death" to track down Renée Reinne and seek revenge on Vaughn's killer. Why 6 months later? Something is up.
I was crying my eyes out...but as I rewatched it last night, things are never how they appear. I am keeping the faith that he is alive.
* cross fingers that I am right*
JJ mentioned clues...well us viewers are smart, we'll find out the truth. one way or another.
Have a great day!
CJ