Early in the film, the young David sees the gravestone of his father, stating that he died in 1841, some months before David's birth. Although no exact dates are given in the novel, David is supposed to be writing his memoirs in 1850, at a time when he is the father to at least four children born after the events of the last chapter. This implies that David was born (and his father died) somewhere around 1815, possibly earlier.
In Dickens' original novel, it is implied that Wilkins Micawber is slightly rotund, balding man. Quite the exact physical opposite of Peter Capaldi who plays him here, and much nearer to previous incarnations played by Bob Hoskins, Arthur Lowe and W.C. Fields. However as exact physical casting is not really adhered to in this film, it can be forgiven that the director also played loosely with his interpretation of this character (and asides from this, Capaldi's version of the character still portrays the blind optimism and shabby charm of Dickens character) .
When David's mother is giving birth to him, she lifts her right foot to the stool and her sneaker is briefly visible.