Whenever Pliskin, Raiden and Rose mention the former leader of Dead Cell, they refer to him as "Colonel Jackson". Since Dead Cell is said to be a U.S. Navy unit, and the rank of "colonel" is never used in the Navy, he should be called "Commander Jackson". (Vamp - a Dead Cell member - later refers to Jackson with this correct rank, so these errors were most likely intentional.)
During the bomb disposal mission, Pliskin mentions "the heliport on Strut H". Strut H is clearly visible from several of the connecting bridges, for example, the bridge connecting Shell 1 & Shell 2, and there is no heliport on top of it. The strut next to it (Strut I) does have a heliport, however. This was due to a modeling error.
On top of Federal Hall, Solidus tells Raiden that George Washington became the first US president "200 years ago today". Washington was inaugurated on April 30, 1789, but this scene takes place on the same day in 2009 - 220 years later, not 200. This is because Solidus is intentionally rounding the number down, presumably to make his dialogue flow better.