Number 47: (inverted) Marshall says that they got the surveillance footage from 74th.
Sloane explains why he injected himself with the green fluid in "After Six."
In the scene where Vaughn leaves the elevator after the meeting with Brill, you can see that someone is standing in the right corner see screenshot.
Vaughn: Your sister... You have to let her go.
Sydney: You're tired. I should let you sleep.
Vaughn: No. My father was killed because he took her from the KGB. He hid her from your mother. That's why she murdered him....I met someone who told me the prophecy. The Passenger and The Chosen One shall battle; neither will survive.
Sark: I'll ask you again: where is The Passenger?
Vaughn: Holding that thing.....you almost look like you've reached puberty.
Jack: Sydney, there's something you should know. When I first learned of Sloane's affair with your mother, I was forced to consider the possibility that I wasn't in fact your biological father.
Sydney: You don't even --
Jack: It's not the case. I had our medical files examined. Our relationship is clear. But I wanted you to know, during that brief time before I was reassured my feelings for you never changed.
Vaughn: Why did you come to me?
Brill: Because it's what he would want me to do.
Brill: I told you that I worked with your father. But what I didn't tell you is I was with him on his final mission.
Vaughn: I know how my father died.
Brill: You don't have a clue.
Sloane: Sydney, whatever grief my apparent death might have caused you, I only wish I could have spared you the pain.
Sydney: When I heard you were dead, any grief I felt was over the possibility of never knowing my sister. I did not grieve for you.
Sloane: All I want to do is to protect my child.
Sydney: After mom died, I used to have these daydreams. I would imagine her leading my girl scout troop or taking me shopping for new school clothes. I thought if only she'd lived, she would have been my best friend. When I learned the truth about her, and saw Irina for who she really was, I was devastated. I won't make the same mistake twice.
Sark: But there are three things that you should understand. The first involves this item I hold in my hands. It's capable of delivering up to 500,000 volts - not enough to kill you, just enough to let me wish it would. The second is I believe Mr. Brill disclosed the location of the Passenger, which means I won't stop until you tell me. And third, Mr. Vaughn, is that I'm going to enjoy this far more than I should.
Richard Roundtree was billed as Special Guest Star in this episode.
This marks the first appearance of Mia Maestro as Nadia Santos. She later attains regular status in season 4.
Sydney: It's that's the kind of thing that got Giordano Bruno burned at the stake.
Giordano Bruno (1548 - 1600) was an Italian philosopher who was executed for his Copernicanism and theological beliefs, because he denied the doctrine of the Trinity and embraced a sort of pantheistic animism.