Continuity mistake: At Rick's funeral, Debbie gives Alice her spike bracelet. The spikes are flat and there aren't that many of them, but at the end when Alice is getting decked out to fight Freddy she pulls the bracelet out of her drawer, and the spikes are very menacing looking and there are more of them. (00:55:25 - 01:13:20)
Continuity mistake: In the scene where Debbie's arms come off you see two right arms fall to the ground instead of a left and a right. (01:06:35)
Continuity mistake: When Freddy is reaching out to take Sheila's glasses off, you can see that the palm and index finger of his hand aren't scarred at all from what was supposed to be an all-consuming fire. (00:43:55)
Continuity mistake: When Dan is wheeled into the operating room, we hear a respirator machine going in the background. Yet he's fully awake and not hooked up to any breathing equipment when he's being brought in. A machine would not be going like that unless the patient was fully under and intubated.