The date on Hiro's watch, October 2, is the same date this episode first aired in most North American areas. See more...
Continuity: When Sylar comes for Isaac the painting of Hiro and the dinosaur is visible in the studio in several shots, even though Hiro took this painting to Linderman several episodes ago. The episode director even comments on it during the audio commentaries.
Revealing: When Mrs. Petrelli is sitting with the dead Peter, just before she lies down on his chest and starts to cry, you can see the "dead" man tilt his head slightly backwards.
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