Hodgkin refers to the bridge crash taking place on the evening of the Diamond Jubilee 43 years earlier: this refers to Queen Victoria's celebration of 60 years of monarchy on June 22nd 1897, thereby dating the film's events to the night of Sunday June 22nd 1941.
The doctor's quote, 'There are more things in heaven and earth ...', is from 'Hamlet' (Act 1, scene 5, line 166).
Tommy Gander makes a comment about the parrot singeing its 'parson's nose'. The 'parson's nose' is a nickname for the pygostyle, the fleshy protuberance visible at the posterior end of a chicken that has been prepared for cooking. It has a swollen appearance because it also contains the uropygial gland that produces preen oil.
Tommy Gander's quote, 'It's a far far better thing I do ....', is from 'A Tale of Two Cities' by Charles Dickens.
When Winthrop is introduced as an all-rounder for the MCC, this indicates that he plays for the English cricket team (the MCC was the name used by the national side for many years) and played as a batsmen and a bowler.
Winthrop comments that Gander reminds him of 'something out of East Lynne'. 'East Lynne', a novel written by Ellen Wood and published in 1861, was a best-seller that was made into a successful play, staged many times. (There have been 15 film versions and one television series).