Continuity: In the scene in the car where Michelle Pfeiffer's character is talking to her daughter about the value of Pi, when they start the scene and show the daughter, you can see a Scion pull up in the background and people start to get out. As they cut back and forth between mother and daughter, each time they show the daughter, the car disappears, then reappears, then disappears again.
Continuity: When Izzy performs "Ironic" in front of an audience she's wearing bright red lipstick. Afterwards when she sits down with Dylan, at first you see the lipstick, keep watching and her lips are bare, keep watching and the lipstick reappears.