What three things does Bob Ewell do to alarm Aunt Alexandra?

In Harper Lee's "To Kill a Mockingbird," Aunt Alexandra is alarmed when Bob Ewell prowls around Judge Taylor's house, loses his job with the WPA and follows Helen Robinson as she goes to work. These events underscore Ewell's feelings of failure and his interest in getting even with Atticus Finch.

Even though Aunt Alexandra is alarmed, she doesn't stop Scout and Jem from leaving for a school pageant. Able to get to the children, Ewell puts his revenge plan into motion and tries to kill them. Only Boo Radley is aware of the danger the children face and intervenes, saving their lives in the process.