Continuity mistake: In A Dog's Purpose, Hannah has a daughter and a young grandson. In A Dog's Journey, the daughter and grandson no longer exist and have been replaced by a son who has died, leaving behind a widow and a much younger granddaughter.
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Suggested correction: Actually Hannah has more children than the ones show in the first movie. In the book it is explained that she had two daughters and a son.
Suggested correction: In the movie, Ethan tells Hannah that she raised two children.
Continuity mistake: Before Hanna says goodbye to Ethan when they are old, she has a glass of lemonade but in the next shot the glass is gone.
Continuity mistake: While Ethan is saying goodbye to Bailey the sun changes between shots.
