Dr. Foley burns the Chucky doll on his right hand with a lighter but when it cuts to a wide shot, Chucky's hand is completely fine.
When Buzz cut Chucky grabs the knife out off the wall wall there is blood on the wall, but when it cuts to Andy pinning him to the wall there is only blood in the hole caused by the knife.
The dried blood on the wheelchair spoke when nica tries to kill herself disappears.
Claire flat-lines after being decapitated indicating a cardiac arrest, but there is still blood spurting, not just oozing, from her arteries.
Multiple errors in depiction of an extended acute care behavioral health unit: very small amount of staff, whom appear to work through every shift. The staff station between hallways is portrayed as designed to have the staff give their back to the hallways, instead of facing them, and the staff are allowed to have ear buds. Staff check of 15 minutes is portrayed as a special order for an at risk patient, instead of being the normal; and there are no night checks. The psychiatrist is portrayed as also the being therapist, for all individual and group sessions, and is present for all hours, even though he also works at another facility. A chemical restraint is used on a patient who is not harming themselves or others; this is not allowed in any state. A person cannot be placed in a behavioral health unit for punching a guard; police would be called, to take to jail, or if deemed to be mentally ill, to an ER or crisis unit for psychiatric evaluation, after which they might be committed to a regular inpatient mental health unit (not an extended one). Hypnosis is portrayed as overpowering an unwilling person, instead of being a guided experience through what the patient allows. The nurse wears an stereotypical outfit that has been out of style for over 40 years, instead of wearing scrubs or a modern nursing uniform. Scalpels and other unnecessary sharps are readily available. The unit is also very clean and very white. All the patients wear gray. But, as it's a fantasy depiction of an acute care unit none of that matters.
At 47:53 into the film, when Chucky is rising out of the grave, the crewman's hands that are lifting him are visible. This is actually Malcolm lifting Chucky, before climbing out of the grave himself.
During the beginning credits, a newspaper article says that Alice Pierce was the only survivor. Pierce was Nica's last name, and since Barb, Alice's mother was her sister, Alice's last name wouldn't be Pierce, it would've been whatever Ian, Alice's father's, last name was.