Jim Broadbent played in the 1995 movie "Richard III" with a young Robert Downey, Jr., who would go on to play the Marvel super-hero character Iron Man. In this movie he plays alongside Eric Bana who played another Marvel super hero in 2004's "Hulk".
When Martin hails the cab on the way to the dinner party, he is holding a bottle of champagne with a gold foil capsule. When he arrives, he has a bottle of Dom Perignon with a black capsule.
In the opening shot of Martin Rose rowing along the Thames, his outfit changes completely, from the medium distance shot (all blue, white stripes down his sides) to the close up shot (white jersey, blue arm stripe, under a short sleeved blue top).