== The Other 48 Days == 

 There was no "flashback" in this episode.  The only argument that there was a flashback would be because the other episodes had reached a certain point in time, and this covered a time period already covered in previous episodes.  However, if you were to use that argument, you would have to count Locke and Kate's entire plotline in "Adrift" as a "Flashback" because it ends at the same point as "Man of Science, Man of Faith".