What some examples of false information, exaggerations, and understatements that the narrator presents?

Example of exaggeration:

In the first place, that stuff bores me, and in the second place, my parents would have about two hemorrhages apiece if I told anything pretty personal about them.

Understatement:

I'll just tell you about this madman stuff that happened to me around last Christmas just before I got pretty run-down and had to come out here and take it easy.

False information:

It was a terrible school, no matter how you looked at it.