Revealing mistake: After Jill's mom returns home from the store, she pulls a box of cereal out of the grocery bag and it is already opened. (01:06:25)
Continuity mistake: The phone in Jenny's hand disappears when she moves downstairs looking for Marnie. (00:07:55)
Continuity mistake: After Chloe stabs Rachel in "Stab 7", blood runs down her chin but in the next shot, her chin is clear of blood. (00:05:15)
Answer: I personally submitted this as a revealing mistake. There is no official statement from Wes Craven or anyone else involved in the making of the movie about it being deliberate. So in my eyes, it's a mistake.
THGhost