The cat statues that Yuki was looking at in Kanna's room change positions between shots.
Kanna doesn't lose her jaw when Kayako kills her in Katasumi (1998), the short film that preceded this film, but in this film when her ghost returns home to kill her mother Noriko, she's missing her jaw.
Kanna's personality seems to have changed between Katasumi (1998) and this film. In Katasumi, Kanna is a more innocent and younger girl, due to having been played by a different actress, while in this film she is more aggressive and defiant.