Selfridge's limousine is a pre-1920 Pierce-Arrow.
This film has been preserved by the Library of Congress - one of only five "Baby Peggy" feature films known to exist as of 2020.
The book Peggy's nursemaid chose for her reading time is an actual book audiences of the time may have known - and it would have gotten a reaction out of them. The book is "Three Weeks" by Elinor Glyn (1864-1943), an erotic romance novel, first published in the UK in 1907.
Rose Plumer's debut.