June says Beaver had chicken pox when he was 4 and measles at 6. But it was disclosed in Beaver's Old Friend (1958) that Beaver had measles before living in the first house shown in the series. Also, he had chicken pox in Beaver's Pigeons (1959). Neither age aligns with those that June states.
In his essay, Beaver states that he and his family met Queen Elizabeth and King Philip of England. However, Philip is properly addressed as "Prince Philip" and can be a king only if he inherited the throne of a country.