The Grudge/Trivia
- The Danza: Yoko Maki as Yoko.
- Hey, It's That Guy!: Sarah Michelle Gellar as Karen is the most obvious example.
- Aubrey is played by Amber Tamblyn.
- Ryo Ishibashi, who plays Detective Nakagawa, is well-known for his roles in Audition and Suicide Club.
- Alex is played by Ted "Joxer the Mighty" Raimi, Sam Raimi's brother.
- Isao Yatsu, who plays the senile old man on the bus, also appeared in the third Japanese movie playing a similar role, and previously appeared as the apartment manager Kamiya in Dark Water. He also had a part in Infection.
- Yoko Maki, who plays Yoko, has appeared in Kamikaze Girls, Infection and Battle Royale II: Requiem.
- This also isn't the first time that Sarah Michelle Gellar and Jason Behr (Doug) have appeared on-screen together - Behr played Billy Fordham in the Buffy the Vampire Slayer Season 2 episode "Lie To Me". Additionally, Clea DuVall (Jennifer) appeared in a Season 1 episode, "Out of Mind, Out of Sight".
- Additionally, Clea DuVall and KaDee Strickland (Susan) have previously appeared in another movie together, Girl, Interrupted.