The Ghost Next Door (1) - S4-E3
Character mistake: In the first scene, in the shot of The Music Academy award, Hannah Fairchild's first name is misspelled as Hanna. (00:01:10 - 00:41:45)
The Ghost Next Door (1) - S4-E3
Deliberate mistake: Right before rising to check out who was calling her name, Hannah sets her laptop, which she was using to write a letter, on the bedspread. The computer screen is shown to be blank, meaning, 1. she switched it off, which she didn't, or 2. it was out of order, which doesn't make sense since she was using it seconds before. (00:02:10)
The Ghost Next Door (1) - S4-E3
Continuity mistake: In the scene where Hannah Fairchild enters Danny Anderson's house, in the close-up shot of her on the front steps before she enters, a huge gust of wind blows and messes up her hair, but in the close-up shot of her entering through the front door, her hair is visibly straight again. (00:15:25 - 00:27:30)
The Ghost Next Door (2) - S4-E4
Revealing mistake: In the montage of important scenes from part one at the start of the episode, when Danny Anderson falls into the bunch of garbage cans, the mask on the stuntman's face becomes undone and reveals him. (00:22:20)
Answer: He repeatedly warns him against using the universal remote for bad purposes. However, Seth, blinded by remote's abilities, completely ignores and disregards Tony's warnings and uses the remote when and how he pleases, which eventually turns against him.