Revealing mistake: When Chucky's disembodied head tries to bite Andy in the beginning, watch closely. When the plaque he's mounted too leans forward suddenly as Chucky snaps at Andy, you can see a rod underneath of it, which was used to make it move and lean forward by the puppeteers.
Cult of Chucky (2017)
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Directed by: Don Mancini
Starring: Brad Dourif, Jennifer Tilly, Alex Vincent, Allison Dawn Doiron, Fiona Dourif
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Question: How does Chucky tranfer his soul into another doll?
Answer: Originally, the serial killer Charles Lee Ray used a voodoo spell to transfer his soul into a "Good Guy" doll in a toy shop, thereby becoming "Chucky" the homicidal doll. Later he acquired a voodoo spell that allowed Chucky to transfer souls multiple times (of course, his ultimate goal has always been to transfer his soul back into a living human body).
Answer: Chucky states that he found a new voodoo spell in the film that allows him to control multiple hosts at once. It's almost like a copy/paste of his spirit. Andy still has the original Chucky, whereas the rest are duplicates.