What three strange events happen in Maycomb?

In Chapter Twenty-Seven, Scout relates a few events that have recently occurred in Maycomb. Mr. Ewell holds down a job for a few days, but then is fired from the WPA (Work Projects Administration) for laziness. One night, alone in his study, Judge Taylor finds the strange shadow of a prowler in his house and proceeds with his reading, but with a gun across his lap. Helen Robinson has been working on the property of Mr. Link Deas, but walks nearly a mile out of her way in order to avoid walking past the Ewell's house, because they "chunk" at her when she passes by. When Mr. Link Deas finds out, he approaches the Ewell house and yells to them, warning them not to bother Helen, or else he'll have them put in jail. The next day, Mr. Ewell follows Helen to work, "crooning foul words" the entire way, but Mr. Link Deas again threatens him with jail and he stops this behavior.