Revealing mistake: When Devil Face cuts J.D's arm the knife's clean. (00:52:47 - 00:53:10)
Other mistake: In the climax Melanie throws the bomb from out of the water, but the bomb is not wet. (01:39:55)
Continuity mistake: The girl that wanted her bully in high school to be tortured filmed the torturing with an iPhone XR then was later holding an iPhone X before the movie ended.
Continuity mistake: Revenge girl takes her flower lei off in her room. The one she removes is pinks and whites. The ones everyone was given were white and yellow.
Continuity mistake: The woman with the 'family' fantasy gets up in the morning, picks up her phone and it shows a date in April. Later, the 'bully' fantasy girl looks at her phone and it shows a date in February.
Continuity mistake: Melanie's phone changes continuously between iPhone X and iPhone XR when she switches on the flashlight in the cave.
Character mistake: Near the end while in the caves Maggie is the first to go missing, but they use the name Gwen multiple times, the actress' actual name.
Suggested correction: Maggie Q is the actress and she plays the character Gwen Olsen.
Continuity mistake: When Melanie is talking to Patrick about their fantasies, before they have begun, the olives in Melanie's martini keep appearing and disappearing from the side of the glass.
