(at around 7 mins) When the Rolls carrying Fitzwilly stops at the Gourmet Wine Shop, the traffic light is green for crossing traffic, so the cars that pass Fitzwilly and go through the intersection are running a red light. The shot should have been filmed when the cross-traffic light was red.
Fitzwilly stops playing piano, but the piano music continues for a few more seconds.
When Fitzwilly is picking out a piano, there is a moving shadow from a piece of equipment.