Olivia Dunham: I just want to go back to before.
Phillip Broyles: Dunham, I don't think you can.
Michael Cerveris makes his first significant appearance in this episode as The Observer/Bald Man. However if you watch the series from the beginning, he makes fleeting appearances in every episode, sometimes on a tv screen. See more...
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Updates: Series 4
Audio problem: In the scene where the team first arrive to investigate the bus, the shot where the team is walking towards the bus is used twice. The first time the shot is used Broyles is speaking and the audio syncs with the video. The second time the shot is used Olivia is speaking, but you can see that Olivia's mouth is not moving and Broyles' mouth is.
Plot hole: When Charlie looks up the file on David Esterbrook, he says that the file shows that Esterbrook is directly responsible for INtREPUS' "controversial" R&D, including pre-natal gene therapy, human/animal hybridization, and viral warfare. Yet later, Olivia says she can find no dirt on Esterbrook who is, in her words, "cleaner than snow". If INtREPUS kept records of their illegal endeavours, then how come Olivia can't find them when the time calls for it?