When the girl is ironing, she never gets a hot iron off the stove; back then, said irons had to be heated from some heat source, usually the stove top. One was used while another was being heated, and then the person would switch when the one ironing got too cool to press the wrinkles out.
The portrait of General Washington in Francie's classroom was issued nationwide to public schools and buildings in 1932 to mark the bicentennial of his birth. The chronology of the story has events taking place at least 20 years earlier.
When Johnny gets up from Francie's bed, the movements of Francie's mouth do not match the words she is speaking.