Other mistake: When Ben, Riley, and Abigail show up at Ben's fathers house, the screen shows a title stating they are now in Philadelphia, PA. However, when Ben's father confesses that he donated the Silence letters, he says "I donated them to the Franklin Institute in Philadelphia." Normally when you tell someone where something is, you don't include the city if you are located in that city at the time. (Not to mention that I'm sure Ben knows exactly where that museum is anyway). This coincides with the next scene where you see sky shots of downtown Philadelphia and the Ben Franklin Bridge, implying they are driving into the downtown area. That means they would be coming in from New Jersey. Maybe Ben's father is supposed to be living in Jersey somewhere, and not in Philadelphia.
Other mistake: When Ian is breaking in to take the Declaration of Independence his team uses a plasma cutter to cut through some metal. A plasma cutter of that size (fairly small and portable, but able to cut through metal of that thickness) requires a 220v power supply and a compressed air supply. I doubt there was a 220v power plug in that area, and I didn't see them carrying around any kind of compressed air tank.
Other mistake: In the scene where Ben, Riley, and Abigail arrive at Patrick's house, the location title at the bottom of the screen says, "Philadelphia, PA." Then, as the Declaration of Independence is being examined, Patrick says that he donated the Silence Dogood letters to "The Franklin Institute in Philadelphia." Finally, as the scene ends, Ben, Riley, and Abigail are in Patrick's car, driving through the night towards Philadelphia.
Other mistake: When Ben enters the Gala dressed in overalls and tool belt, he enters a door across the street from where Riley is parked. There is a security guard outside that door who waves Ben on into the building. As Ben exits that same door, there is no security guard, which seems hard to believe with such a big event.
Add timeSheri Hartman