Child's Play 2 - Puppeteer's Head
At the orphanage, when Kyle, Andy and that woman are in the room, this is where the goof happens. The woman picks up Chucky and looks at him. Chucky says "Amazing, isn't it?" and he stabs her twice. In the shot angling from behind Chucky, as the woman reacts in pain, you can see on the right hand side of the frame, the head of a crew member behind woman.
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|It's there on the right, the head of a crew member