Factual error: When they are in Costco there is music playing in the store. Costco does not play music in their stores.
Revealing mistake: Near the end it cuts to a scene where there is a small group of musicians playing classical music. In the centre is a male violinist playing but his bow is about 3 inches away from the violin.
Character mistake: On the tour boat in London, the voice on the loudspeaker says 'if you look to your right, you will see the Tower of London'. Except it's on the left, given the direction the boat is travelling.
Revealing mistake: When Han is firing the Gatling gun at Frank and Marvin, he is on one side of the street, firing across the street and through the parked cars. Frank and Marvin are lying on the ground on the sidewalk, but some of the bullets' exit holes (after shooting through the vehicles) fold inwards, when they should have bent the metal outwards.
Continuity mistake: In the scene at a "Russian" air base, the US troops, along with Anthony Hopkins, are surrounding and about to board a Russian made AN-12, NATO codename Cub, with US AIR FORCE painted on the side. When it subsequently takes off, the aircraft no longer has the lettering on the side and appears to be footage of an older unrelated AN-12 edited in.