The building Gen. Benedict Arnold presents to Peggy Shipman as the Penn Mansion in Philadelphia is actually the capitol building in Colonial Williamsburg, VA.
American Gen. Charles Lee is portrayed as being bribed to lead the Continental Army into a trap at the 1778 Battle of Monmouth, New Jersey. Lee was court-martialed and suspended for his actions at Monmouth, but the charge of direct treason is undocumented.
The Sergeant Hickey assassination plot against Gen. George Washington is depicted as happening during the summer of 1778. In reality it occurred in March of 1776.