A Lying Witch and a Warden - S1-E1
Continuity mistake: When Luz hides in a cell at the Conformatorium, the lever for Tiny Nose's cell is up. When Warden Wrath enters, the lever is down, and then he pulls it up again. (00:11:29 - 00:11:57)
The Intruder - S1-E4
Continuity mistake: When Eda changes into her pyjamas, her couch is incorrectly colored green. This is fixed in the next shot. (00:04:30)
Continuity mistake: When Amity almost passes out from anger, she is missing her black nail polish. (00:07:45)
Continuity mistake: In early versions of the episode, Luz is shown wearing her Hexside school uniform before she even receives it. This mistake spoils the ending. Fortunately, it was fixed later on. (00:00:01 - 00:00:40)
Really Small Problems - S1-E14
Continuity mistake: When Luz is showing Gus and Willow the removing thumb trick, she uses her pointer finger to cover her thumb. However, when the shot changes to show Gus a Willow's reactions, her pointer finger is up. (00:00:07)
Continuity mistake: At the beginning, Boscha is changing her nails on her right hand. When the shot changes, it's on her left hand. (00:00:08)