When Chris and Chloe have dinner with Tom and Heather, Heather's hair is in front of her face in one shot, and tucked behind her ear a second later, even though she never touches it.
When Chris and Chloe meet Tom and Nola at the bar, Chloe stands up to greet the other couple, leaving a champagne cocktail on the bar, which disappears in the next shot.
The computer screens on the detective's desk read 'London Police,' which does not exist. It should read Metropolitan Police, City of London Police, or British Transport Police.
Christopher "Chris" Wilton: It would be fitting if I were apprehended... and punished. At least there would be some small sign of justice - some small measure of hope for the possibility of meaning.