When Dan time travels at the end of the episode it is the first (and only) time in the series that Katie actually sees him do it.
Evan recognizes Livia as a traveler, saying you can always tell by the shoes. This is the same thing Steven Kowalchuck says to Dan in the episode "Keepers".
Dan: Did you know that, um, you and I were both born during a rare celestial occurrence? Livia: Uh, no. Dan: The Joseph Lee Comet. Livia: What do you think it means? Dan: Well, right now, I think it means we're both playing Cupid because another time traveler is about to enter that building.
Evan: You're here for a reason, right?
Dan: Yeah. Not the reason you think.
Evan: Well, we never really know in the beginning. It's me. You're here for me. Are, are you hungry? Because it, it always makes me hungry. I can get you food. See, I, I saw what you did. How you got here.
Dan: Wait. How I got here?
Evan: I know who you are, man. I'm one of you.
Dan: What causes it? Why are we doing it? Evan: I haven't learned much since the last few months...except that, uh, whoever's pulling our strings is doing it for a reason. Dan, you're gonna change more lives than explorers, scientists, doctors, anyone.
Evan: I met her in college. I was married to her for 20 years. About 15 years back the, uh, the travels started and I tried to live as normal a life as possible. What a joke. Dan: You're one of us. Evan: I think I mentioned that.
Dan: Maybe you should lose the flowers. Evan: Why? Women love flowers. Livia: It's a little needy. Evan: Oh, I feel needy.
Evan: (When he first sees Livia) Who are you? Dan: Uh, it's a friend. Evan: Ha, she's one of us. You can tell by the shoes.
Dan: I'm sorry I didn't get a chance to say goodbye to Annette. Kate: Yeah, I know, it's usually your favorite part of her visit.
Music: "Hey There Delilah" by Plain White T's.
Dan: You know how much I love you?
Zach: Yes.
Dan: How much?
Zach: To the moon and back.
The line "to the moon and back" comes from the children's book "Guess How Much I Love You" by Sam McBratney.
The episode is named for a popular Mexican song about love and betrayal written by Alberto DomÃnguez. Perfidia is also the title of a 1939 movie made in Mexico.
S 1 : Ep 13
Aired 12/19/07 (42:10)
S 1 : Ep 12
Aired 12/17/07 (41:23)
S 1 : Ep 11
Aired 12/10/07 (43:33)
S 1 : Ep 10
Aired 11/26/07 (1:25:00)
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