They name all of the streets and neighborhoods in all of the five boroughs of New York City. That's a long list too; it also takes a while. The point is that Julian didn't actually go straight home, like he said on Date #2, after losing track of Vivian's journey into oncoming highway traffic.
Joanna: "There sure is a lot of food in your refrigerator."
Julian: "I wanted dinner to be perfect for you, so I covered the bases."
The cops continue to talk about roads and neighborhoods. Did he lie? Yes he did. Is there a way to tell Joanna that? Not really, because she is on a date. A date with danger!
Julian, verbatim: "Before I got here this afternoon, I hadn't been here in so long the only thing in there was beer and month-old pad thai that screamed when I threw it away."
Joanna, immediately: "You said you came here the night Vivian died, though."
Julian: "Split hairs much? Yeah, I said in an offhand way that I came home, just like I said a second ago in an offhand way that I had old pad thai in my fridge. This isn't a deposition."
What it is, is, a stretch to make Joanna look like a Baker Street Irregular -- even though she doesn't know about Will's discovery downstairs, she still has the keen mind and whipsmart detective instincts to have perceived an untrue statement -- but since she jumped on him for an alibi that didn't even have anything wrong with it, it just makes her look kinda nuts instead. "I thought you said this salad had red beans in it, but these are clearly kidney beans, which are vaguely different.J'accuse!"
Anyway, he's chopping red peppers while she subjects him to this calendarial third-degree, which means he's got a big ol' Santoku in hand, so she grabs a corkscrew just in case he needs to be blinded in a hurry. It's obnoxious enough that he comes clean.
"I did not go straight home, I went to Cassie's, because I was freaked out and I wanted to do some drugs and fuck Cassie. Cassie's a girl I like to fuck and do drugs with. At what point in our date were you expecting me to tell you about that, exactly? And you know what? Either way, fuck you. You're giving me this shit about where I drove that night and I was going to make a joke about giving you my alibi until I looked you in the eye and realized that you actually were looking for my alibi. Because you think I killed my own sister. So fuck you, you are dumped. No dinner for you. No red beans, nor kidney ones. Get the fuck out of my house."