what does rebecca nurse think is wrong with the girls & what is unusual about giles corey in act one?

Rebecca suggests that the entire problem, with both Betty and Ruth, is childish pranks. Giles Corey is an older man who speaks plainly and has a penchant for suing his friends and neighbours for various offences. Corey is also married for the second time and wonders out loud (not a good thing) about his wife's penchant for reading books.