In addition to featuring several huge surprises, "Par Avion" included the usual set of Easter eggs. Some were clear-cut, and some have been disputed on various blogs and message boards. So far, fans have come up with a decent list of clues, questions, and theories.

The Numbers: After Claire's tragic car accident, the number 108 was shown on her odometer (108 is the sum of all six numbers, as well as the magic timer number in the Hatch). During another flashback scene in the hospital, the following could be heard over the loudspeaker: "Dr. Addison, phone call on line 4." These examples could reinforce the idea that the numbers are cursed.