This episode did not feature the standard opening titles.

Lena Olin does not appear in this episode.

This episode aired at the special time of 8:00 due to the Super Bowl.

This episode begins in media res.

Number 47: Sydney is to track and hack server 47, which is thought to be a network that links all the SD cells.

Number 47: The Alliance purchased a 747 to keep the server airborne.

Number 47: When Sydney accesses to server 47, you can see several 47s on the scrolling code.

This episode marks the destruction of all SD cells, including SD-6.

This episode marks the death of Francie.

This is the highest-rated episode in the history of the show with 17.400.000 viewers.

"The Futon Critic" rated this episode the 4th best episode of 2003 (of all tv shows).

Sydney: I need you to tell me.
Vaughn: You need me to tell you what? That when you're on operations, I can't sleep at night? That when we're in debrief I have to force myself to remember what the hell we're supposed to be reviewing when all I wanna do is kiss you?

Vaughn: And the thing that makes me crazy every day is people that would kill us if we're seen together - the Alliance, SD-6, Sloane - are the very forces that brought you into my life to begin with. What kind of a sick joke is that?

Sark: The new boss has a dreadful personality, don't you think?
Sydney: I've seen worse.
Sark: Am I supposed to take that personally?

Weiss: There's no way that guy smells as good as you.
Vaughn: It's aftershave. I got a new aftershave.
Weiss: Yeah, well, I'd lighten up on it.
Vaughn: Yeah?
Weiss: Oh, yeah. To the point of, er, non-use.

Geiger: Jack, I know you are disloyal. I know your daughter is too. Both your files, there were so many red flags, I thought I was in a Russian airport.

"The Enemy Walks In"

Sydney mentions the time Dixon had suspicions about her being a double agent.