Continuity mistake: When they jump in the pool, they drop the guitar. When they jump out their guitar is no longer in the pool.
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Coco (2017)
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Directed by: Lee Unkrich, Adrian Molina
Starring: Benjamin Bratt, Gael Garcia Bernal, Edward James Olmos, Alanna Ubach
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Clerk: I am terribly allergic.
Miguel: But Dante doesn't have any hair.
Clerk: And I don't have a nose, and yet, here we are.
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Answer: It is never really explained in the movie, but we could assume that whenever someone dies they keep whatever items they had on them. Hector may have had the photo on his person when he died.