What three things happened to further frustrate Bob Ewell?

Mr. Ewell holds down a job for a few days, but then is fired from the WPA (Work Projects Administration) for laziness.

When Mr. Link Deas finds out Bob has been harassing Helen, he approaches the Ewell house and yells to them, warning them not to bother Helen, or else he'll have them put in jail.

Ewell also feels humiliated from the trial because, although he won his case, everyone in Maycomb now knows the truth.