Not really, but Syd is being stalked and she is told that she's probably just hallucinating. The person saying this genuinely believes that she's hallucinating though
Sydney is followed by another character, at first without her knowledge. She is later made aware, and there are several scenes detailing her paranoia including scenes where other characters try to convince her that it isn't real.
SPOILER ALERT
In the last episode, Syd starts to see her experiences not as super powers but paranoid delusions. Then, at the dance, as Brad is verbally harrassing her in front of all of everyone, she again starts to feel the "powers" and then Brad's head suddenly and gruesomely explodes as if she or her powers caused it.
There a
In a scene in the library, there are lots of flashing lights. It cuts on and off between this scene and another, so it can be hard to tell when they will stop flickering.