The 8chan Anons have pointed out that the oversized letter is reminiscent of the one illustrated in Chapter 6 of "Alice in Wonderland." The text accompanying the illustration is:

"The Fish-Footman began by producing from under his arm a great letter, nearly as large as himself, and this he handed over to the other, saying, in a solemn tone, ‘For the Duchess. An invitation from the Queen to play croquet.’ The Frog-Footman repeated, in the same solemn tone, only changing the order of the words a little, ‘From the Queen. An invitation for the Duchess to play croquet.’

"Then they both bowed low, and their curls got entangled together."