Continuity mistake: After escaping interrogation Bourne switches SIM cards and throws the phone back down with it facing down. When we see the American awake the phone is now facing upwards. (00:30:10)
Continuity mistake: When Bourne pushes Ward's head to the table and says, "I told you people to leave us alone.", you can see Ward's glasses. Two shots later his glasses suddenly disappear. (01:12:45)
Continuity mistake: The blue Saab convertible belonging to the Berlin-based assassin is parked with all wheels on the road when the call-in team arrives in a silver 4x4. Shortly afterwards, the same car parked almost completely on the sidewalk when the assassin's house explodes. (00:41:50)
Answer: Picot from The Bourne Identity is not in The Bourne Supremacy. The one Jason Bourne pays a visit is called Jardo (director Paul Greengrass mentions this on the commentary track) and lives in Munich (visible on screen), ie. South Germany.