The episode's title, "Paradise Lost", refers to the epic poem by the 17th-century English poet John Milton. Several artists have provided illustrations for this text over the years including the English artists William Blake (watercolors in the early 19th century) and John Martin (mezzotint engravings in 1824), in addition etchings by the French artist Gustave Doré c. 1866.
"The Persistence of Memory" establishes that Bay and Daphne's birthday is October 22, 1995, which means that this episode starts in-story on October 20, 2011 and ends on the girls' actual birthday, October 22, 2011.
Peanut butter chocolate chip pancakes are Bay's favorite but Daphne doesn't like peanut butter.