This part of the park is used entirely by the workers; everyone else will have to go to the other side.

[…] little booklet called the 'deco' (decorated friendship book), passes from person to person through the mail in an envelope with each recipient decorating a page including their name and address before passing it on.

Paronomasia to the sense alludes, When words but little varied it includes.]

sergeant surgeon, i.e. a servant, or attendant, surgeon