In the first shot of the train approaching, the train is a single-carriage Class 153, but when Martin's parents get off the train it is a two-carriage Class 158.
At the golf course, Christopher tells Joan all he wants is his share of the inheritance minus 40 years' rent. By his reckoning Joan owes him inheritance share PLUS rent for the years she's been living there rent free.
Right after Danny leaves the talent show, a boom is visible.