The narrator states that "gold was discovered near San Francisco in 1849". The gold discovery that started the California Gold Rush occurred on January 24, 1848 in Coloma, about 110 miles northeast of San Francisco.
The narrator refers to the "turn of the 19th century" when he means the turn of the 20th.
Although the summary of San Francisco's early 20th-century history omits mention of the devastating earthquake and fire of 1906, this was evidently an editorial choice based on its not being included in the exposition pageant.