Continuity mistake: In Part 1, Kimble worried about Gerard tracing him by a match he left behind. We got a close-up when he tore the match out of the book: it was the 3rd in a row of 5. But here, as he looks at the matchbook and worries again, the close-up shows the only match missing from the book is the 5th one.
Continuity mistake: When Gerard leaves the cell block, Kimble is at the cell door with his hands on the bars. Next shot, as Gerard exits, the cell door is visible in the background, and Kimble is no longer standing there. But in an immediate cut back to the cell, he's back with his hands on the bars again.