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Parker uses Netscape 3.0 on Mac OS (classic) to browse the Internet on October 26, 1996, the date of the sixth game of the 1996 World Series. This is historically correct as the browser was released on August 19, 1996. The websites that he visits appear to be large static images, which contain the whole page pre-rendered separately.
Hachi is portrayed by three dogs: Chico, Layla, and Forrest.
On May 19, 2012, a bronze statue of the Japanese dog Hachiko was unveiled at the train depot at Woonsocket Depot Square where the film was shot. It is an exact replica of the bronze statue of Hachiko which resides in front of Shibuya Station in Japan.
After Hachiko's Master died, Hachiko was taken in by the Gardener of the Ueno family.
When Parker searches information about Akita on Internet, he comes across a picture of Ueno and Hachiko from 1924.
To age Hachi, in addition to using makeup to dull the colors of his coat, tiny weights were used to make his ears and tail droop.