At the 45:21 mark (about 52 minutes with commercials), as Jonathan is fighting Claude Beauvais, he ducks to avoid a punch and splits his pants.
The stock footage of Concorde used when the Harts fly to France displays generic Concorde livery which was not used by any operator of the aircraft. This is reused footage of an Air France Concorde which was given this livery for use in the movie "The Concorde... Airport '79".
When the Harts show the gardener what is supposed to be a family portrait, you can clearly see that it's a completely different picture.