Tub had been waiting for an hour in the falling snow.
-- Narration (N/A paragraph 1)

Importance: This is the very first line of the story. It has multiple functions, including the establishment of cold, snowy winter as a key element of the setting. It also positions Tub as the main point-of-view character in the story and foreshadows the high level of insensitivity conveyed by his supposed friends, Frank and Kenny.

I won't mention anything about a certain babysitter.
-- Kenny (N/A paragraph 1)

Importance: Kenny says this in order to make fun of Frank, who is having an extramarital affair with the 16-year-old girl who babysits his children. However, at this point in the story, neither Tub nor the reader know about this affair, and so this remark from Kenny is rather cryptic, thereby foreshadowing the later narrative revelation of the affair.

Tub, you haven't seen your own balls in ten years.
-- Frank (N/A paragraph 15)

Importance: Frank says this while he and Kenny are making...