Factual error: Dutch police cars don't look like they do in the movie, with their blue and white checkerboard pattern. They had blue and orange diagonal stripes on the side. In this movie, they look much closer to what British police cars look like.
Factual error: To my knowledge there is no metro in The Hague. And the only tram in the Hague that goes through a tunnel looks totally different.
Factual error: The "blend right in" car they steal and crash deploys its airbags, which stay inflated, and Samuel L. Jackson shoots them to deflate them. That's not how airbags work - they deflate immediately, that's part of how they cushion the impact.
Factual error: When they are transferring Kincaid from his prison in Manchester to an airport, they travel through Coventry city centre, where he escapes. There is no need to travel through Coventry. Manchester has an airport, there is no airport in or near Coventry which requires you to leave the motorway network and travel through the city.
Factual error: In the flashback to Whitman's first hit, that of the killer of a pastor, a rook is shown. This bird is not found in the US.
Factual error: There is no Dover-to-Amsterdam ferry service. Such a ferry would quickly cross the English Channel and then sail northeast along the coasts of France, Belgium and the Netherlands (passing The Hague on the way).
Answer: You are right. It isn't hearsay and this is a mistake.