Other mistake: Curtis grabs Alisha's hand without activating her power. (00:16:45)
Continuity mistake: Harriet's bedroom appears to be in Hartford rather than Mrs. Goddard's school. In the scenes shot inside Harriet's room, we see that she has a distinctive window that is a square set within a circle. In shots of the exterior of Hartford, that window is visible, while shots of the exterior of Mrs. Goddard's show a building without features that would have windows of such style.
Continuity mistake: After the officers show up in Kim's office regarding the kidnapping, in the closeup one of them uses his left hand to contact Control via his shoulder mic, but in the next wideshot it's his right hand up at the radio mic.