When Martine (Dawn Addams) goes to Simons' (Drake's), they toast ((Drake saying); 'eat, drink, and be merry...' (Martine finishing) '...for tomorrow we shall die.' This is a conflation - a combination of 2 - biblical sayings, those being; Ecclesiastes 8:15; 'then I commended mirth, because a man hath no better thing under the sun, than to eat, and to drink, and to be merry' Isaiah 22:13; 'let us eat and drink; for to morrow we shall die.'
In this, the first (hour-long) episode, when Patrick Newell is first seen (as he sits down in the chair at 'G's office) on the wall, behind him to his right, is an image of an object which will become very iconic, in Patrick McGoohan's follow-up series; a pennyfarthing.
In the Casino, Drake is playing Baccart. When he gathers his chips you realize he is at the number six spot.