This episode is actually a 'prequel' to the show. FOX counts it as a "series preview". In their press release for episode 2, they stated that as the "series premiere" episode.

This episode reveals that Christopher speaks fluent Japanese.

Apparently, the train has an estimated speed of 200 miles per hour, and can make the distance from San Francisco to Los Angeles in 3 hours.

Carmine, Christopher's dog, is named after Carmine Infantino, one of the creators of the comic book character.

As you can see in the overview of San Francisco, the California bullet train consists of 11 trailers.

Hollis: Blending in. You have no idea what it's like, always blending in. You forget who you are. Eventually you start to forget who you ever were. They push you and push you further into the margins, treat you like dirt, take away your manhood. Make you small. Somebody had to do something about it.

Hollis: You just committed suicide for that snake, that rat. You realize that?
Christopher: Well, first of all I don't think you can be both of those things at the same time.

Christopher: I think we've been here for, what, six and a half hours? I'm tired. I missed lunch. Enough already.
Hollis: Are you crazy?
Christopher: Am I crazy? I'm assuming that was a rhetorical question.

Christopher: I work with a cover. Blend into the background. Let you appear vulnerable so the threat reveals itself. And then eliminate the threat.

(while walking through the train station towards some Japanese gentlemen)
Christopher: Let's go over the cover again. Who am I?
Stephanie: You're Tony Graham, my new translator. [...] While we're on the subject, you are fluent in Japanese, right?
Christopher: Guess we'll find out, won't we?
(Chance has a long Japanese conversation with one of the gentlemen and then looks at a surprised Stephanie)

Stephanie Dobbs: What did you just say?
Christopher: Oh, he wanted to know how I recognized that his dialect was Satsuma-Ben. Told him my grandfather was stationed in Tokyo. After the war, dated a steward from a small fishing village on the island of Kyushu. My grandfather sponsored him when he came to the U.S. from college. Became a friend of the family and taught me Japanese.
Stephanie Dobbs: Wow--that's... is that true?
Christopher: No.

Christopher: What's the tab for all this?
Stephanie Dobbs: All in? About $80 billion.
Christopher: How much of this came from my taxes?
Stephanie Dobbs: About $62 billion.
Christopher: Even I want to kill you just a little bit right now.

Guerrero: Afraid we're at an impasse.
Latino Thug: We're at a what?
Guerrero: Impasse. It means we disagree without prospect of resolution.
Latino Thug: You know, we came here to explain it to you, but you don't seem to be getting it. Maybe the three of us can take a little walk out back to the alley. We can explain it a little better. So there's no... impasse.
Guerrero: I got to warn you guys, if this gets violent, I'm gonna fight back.
Latino Thug: You think you're gonna fight back?
Guerrero: All right, maybe fight back's a little misleading. I'll take the beating 'cause that's all you two amateurs are cleared to do. And then one night soon, I'm gonna break into your houses and kill each of you in your sleep. I'll probably start with you, Alfredo. That way Steven here can have a few extra days with Marla and the girls. It's only fair.
Latino Thug: How do you know my name?
Guerrero: Your employer keeps information on a drive he thinks is secure. It isn't. Shall we?
(the men quickly leave)

Guerrero: Hey, dude.
Winston: Breaking and entering is a crime, you know.
Guerrero: Yeah, it's good to see you too, Winston. It's been a while.
Winston: Oh, not long enough. What are you doing in my office? And what the hell are you doing on my computer?
Guerrero: I'm checking out the contents of Mark Hoffer's hard drive. There's not much here, it's mostly personal.
Winston: Do I want to know how you came about it?
Guerrero: Editor at the paper owes me. A couple of years ago, a gas company hired a guy to hassle him over a story he's working. It got nasty. I got him out of it.
Winston: How?
Guerrero: I decided to stop hassling him.

Stephanie Dobbs: A vest? You wore a vest? Where's my vest?
Christopher: I'm your vest.

The Client: Man, you crazy?
Christopher: Let's find out.

When Chance kicks out the window on the train, it blows inward. Anyone with any experience of how air pressure works on a speeding object would realize that, due to the high speed of the train, it would blow outward instead, and suck out objects in its immediate vicinity with great force.

From the overview of San Francisco, the train has 11 trailers. However, in a later shot, there are obviously more than 11.

The speed of the train keeps changing from the angles outside the train and from those within (as you can see outside the windows).

In some shots, the nature around the train keeps changing from outside and inside.

When Chance sees a man walking towards him and Stephanie while they talk on the train, the window has a clear reflection of the man, but nothing else.