At the police officers retirement party, as a tray of drinks is placed on the table there is a carriage clock that shows the time as ten past ten (10:10). A minute and a bit later as the clock is presented it has gone back six minutes and shows 10:04.
Wrongly considered a goof: in the opening sequence, Haskins is overlooking the wrong bank - the raid is taking place at a different bank, established later as 200 yards away. The two locations are inter-cut.
The opening scene shows a bank in question as the National Anglia Bank but from Haskins viewpoint on an opposing roof, one can clearly see National Westminster Bank.