The diary has a common figure on the front from Precious Moments but the Precious Moments company was not formed until 1989 and would not have been available to be printed on an item in 1968.
Brenda and the librarian say the Apollo 11 moon landing happened on July 18, 1969. However, it actually took place on July 20, 1969.
In May 1969, Seth Brown and Maryanne Bagley attend a Donovan concert in Beverly Hills. In reality, Donovan did not perform any concerts in the United States until September of that year.