Olivia Dunham: I just want to go back to before.
Phillip Broyles: Dunham, I don't think you can.
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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.
Continuity: This episode takes place over one day. It's Olivia's birthday at the start of the episode, and at night, she gets the card from her stepfather, implying that it's still the same day. Right before Broyles yells at Olivia in the Harvard halls, there is an establishing shot of Harvard where it is nighttime outside, but inside the building, there's sunlight coming through the windows.