(2004, Paul Bettany, Kirsten Dunst)

London scenes include a First London Dennis Trident and a passing Routemaster:

….but there's also a night close encounter with an early Routemaster, registration in the WLTxxx series:

This scene was included in the BBC3 show 'Great Movie Mistakes' shown at Easter 2010 and hosted by comedian Robert Webb. The way the footage is cut makes it seem that the bus first seen in the distance suddenly appears directly behind Paul Bettany's car - but it's stretching a point in a show stretched to three hours to call it a 'movie mistake'.