Question: Is there any explanation to how Agent Coulson is alive even after Loki killed him in The Avengers?
Question: Can't remember which episode, but when Celeste is put back into her body, she has a French accent and speaks French, but in previous episodes in the flashbacks she had a normal accent. Am I missing something?
Answer: She was in a different body.
Chosen answer: Coulson believes he was resuscitated then sent to Tahiti to recuperate. "A magical place," he calls it. But in the "Agents of S.H.I.E.L.D." episode "The Magical Place", Coulson, through a mind-reading machine, learns that he was treated by S.H.I.E.L.D. and a fake memory of Tahiti was placed as a "mask" of sorts over the painful memory of the operation, which involved a drug seemingly of alien origin to repair the damage, coupled with a lot of morally dubious surgery.