Continuity mistake: 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.

Fringe (2008)
1 continuity mistake in The Cure - chronological order
Starring: Joshua Jackson, John Noble, Anna Torv, Jasika Nicole
Continuity mistake: Charlie, Olivia's former partner and friend in the FBI shows up in this episode during the interview with Mrs. Rusk, but Charlie was killed off by one of the shapeshifters in a previous episode, and the shapeshifter that killed Charlie was himself killed off by Olivia, who in other episodes reflected back on killing him. This episode was supposedly meant to be in season 1 as ep 21 or 22. Unknown why they didn't air it then, and decided to put it in the middle of season 2 (for no apparent reason).
Phillip Broyles: Someone out there is experimenting, only the whole world is their lab.
The Arrival - S1-E4
Trivia: 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.
Question: In the original timeline, when Fauxlivia and our Olivia are in their opposite universes, the thing that makes our Olivia remember her real life and try to escape is the memory of Peter. In the new timeline, he doesn't exist. When Walternate has found and synthesised the Cortexiphan, he says that our Olivia is no longer necessary and to kill her. How did she get back to our universe with no memories of Peter, and no alternate Broyles helping her to escape and being sent to us dead with one leg?
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Answer: In the time line of Season 4, William Bell is trying to destroy both universes to create a new one, and he needs Olivia to power the collapse. So he helped her escape. But the real question is, if not in search of Peter, why Olivia has to travel to the alternate universe to be captured and replaced?
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