Audio problem: In the scene where Penny and Johnny are teaching Baby their dance routine you see Penny putting on a record, if you look closely you can see that Penny moves the arm to put the record on then right away you see her taking the arm away even though the music has started. Even if it's a directorial device for us to hear different music than they do, it's still a mistake because she's not actually put the record on, meaning they've not got any music playing. (00:36:35)
Audio problem: In the scene where Freddy cuts off a doll's head to replace Wondermut's old toy Bob, there is a close-up of the doll head being shaken with Freddy's head visible in the background. You hear Freddy saying, "Look Wondermut. I found Bob," but you can see that Freddie's lips aren't moving.