Continuity mistake: Harry stands on top of a building with a girl folding paper planes. The plane they fold is folded with a blunt front. He throws it off the building and then the plane flies, all of a sudden the nose is sharp, this is visible. (00:12:10)
Factual error: When Marion picks up the phone to call to score a hit, the number she should dial is 934 8777. However, listen to the pitches of the keys she dials. The pattern should sound like: EECDCCC. The pattern she dials is: DCDEDDD. She is clearly not dialing 934 8777. (01:16:25)
Revealing mistake: Whenever someone takes drugs and their pupils "dilate" you can see that it's a normal eye being distorted by a computer because the arc of reflected light also is distorted.
Answer: Sarah Goldfarb is not catatonic, but she appears lethargic and withdrawn after the ECT, and she has lost the vigour and excitement she had while taking the diet pills. The way she walks around suggests she has been given typical antipsychotics (eg thorazine, stelazine) to subdue her.