A Nightmare On Elm Street 3: Dream Warriors (1987)

Continuity mistake: When Neil and Lt. Thompson gets out of the car the front lights switch from on and off between shots. (01:16:00)

Mortug

Continuity mistake: When Freddy and Kristen are fighting in the boiler room, there are some barrels full of bones. Later they disappear.

Continuity mistake: When Philip is sleepwalking, he walks out of the room since the door is wide open. Yet in the scene where Joey is slamming on everyone's doors to wake them up, we see that the door to Philip's room is shut because Kincaid is seen opening the door.

Continuity mistake: The day Kristin is admitted into the hospital, she is screaming and fighting with the staff. She then cuts Max on his right inner arm with a scalpel. In the next scene where Max is introducing the kids to Nancy, Max has a very small band-aid where Kristin cut him yet the band-aid is on the outer part of his arm by his elbow.

Continuity mistake: In the opening scene, Kristen gets a spoonful of coffee and as she puts it in her mouth you can see there's no coffee on the spoon.

Continuity mistake: When Jennifer's head goes into the TV, the antennas on top are gone just after Freddie's arms come out of the TV, but in the next shot they are back.