Continuity mistake: As the cops are taking the Hit and Run Son away, notice he his carrying a red plaid tote bag. Later in the movie, it miraculously appears in the possession of Still Working on the Same Painting. It can be plainly seen as she and her friend, Having a Day, are walking into the city sunset.
Continuity mistake: In the beginning scene of the movie he gets off the bus and gets into taxi number 3 which has whitewall tires front and rear and no sign on the rear door. He talks to the driver for approx. 5 minutes, then they stop. When he gets out of the taxi, it is no longer number 3 but is now number 38, which has a blackwall tire on the front, whitewall on the rear, and a "no smoking" sign on the door.