Continuity mistake: When Ben finds the glasses at Independence Hall, it is 3:20 because of daytime savings time. However when the bad guys chase Abigail and Riley in the market they pass a large clock showing the time to be 2:37. (01:12:15 - 01:17:10)
Suggested correction: Actually, many places at a market like that sell old antiques and even old clocks. That could simply be one of them. Even if it was supposed to tell time, people often forget to set their clocks forward or back for Daylight Savings Time, and that could have happened here. Many of the clocks at my home and school are currently like that.