Which aspect of these lines from "The Cop and the Anthem" by O. Henry contributes most to their humorous style?
A dead leaf fell in Soapy's lap. That was Jack Frost's card. Jack is kind to the regular denizens of Madison Square, and gives fair warning of his annual call. At the corners of four streets he hands his pasteboard to the North Wind, footman of the mansion of All Outdoors, so that the inhabitants thereof may make ready.

the use of long, unfamiliar words

nonstandard spelling

unusual figures of speech

a change of tense