Various New York City street scenes are shown during each episode, and some must be some fairly old file footage. In this episode you see an NYPD Patrol Car drive by that is painted mostly blue with white stripes. The last time NYPD cars were painted that color was in 1996. In 1997 they were changed to mainly white with blue stripes and the last of the 'blues' were off the road by 1999 or 2000 the latest. For an excellent history of the NYPD and their vehicles, go here: http://www.policeny.com/home.html
Marni: Everyone's got clowns in their closet, Nate. I've shown you all of mine.
Nate: Wait, there was only one clown, right?
Marni: It's a figure of speech.
Nate: No it isn't!
Marni: Look Nate, if you have baggage, I want to know about it.
Nate: If!?! Have you met me!?!
Marni: Halfsies on the orange juice means half, Clown. Half! You're not dying of scurvy!
Bowie: Nathan, you got to have a place you can take a woman back to. Me, I make my place like a bed and breakfast. I got slippers, nice soft bathrobes, croissants in a basket. Sends ladies the message: "Thank you for staying, and next time, bring a friend!"
Chinese Food Delivery Man: (looking at Bowie's Chinese character tattoo) Where did you get that tattoo?
Bowie: New Orleans. It means fiery strength.
Chinese Food Delivery Man: (laughs) I don't think so.
Bowie: Then what does it mean?
Chinese Food Delivery Man: I can't really translate it. The closest I can come to it is "Lil' Bitch".
Nate: (on the phone) Hey, so what are you doing right now?
Marnie: (playfully) Right now... well... I'm in my PJs... rubbing lotion... on my feet because I have callouses.
Nate: Yeah, nice!
Originally there was a scene where Marni, naked under the trench coat, tells an older woman on the subway that she's not wearing anything under the coat. The woman then tells Marni that she's not really a woman. This scene was used in early promos for the show but ended up getting cut out.
Marni's cellular ringtone is "Mahna Mahna," the famous Muppet song that she attempted to stage as a duet during one of the ill-fated dates shown in the pilot episode.
Marni: I'm pretty sure 500.4 is botany.
Botany was 581 until 1996 when it was moved to 580. 500.4 has never been used for any subject.