TedStixon

Revealing mistake: Jennifer/Tiffany's maid reacts to being hit with the doll before it makes contact with her.

TedStixon

Revealing mistake: When Glen cuts Chucky apart, you can pretty obviously see where the fabric on Chucky's clothes has been pre-cut and then "blended together", so they will "break apart" easily when the ax hits. The ax also doesn't always hit exactly where the limb "cuts off".

TedStixon

Revealing mistake: The "semen" that drips off the turkey baster is painfully obviously CGI. It doesn't quite match the movement perfectly and looks incredibly "flat".

TedStixon

Revealing mistake: When Tiffany is using the turkey baster to inseminate Jennifer, you can tell she's not squeezing the baster, and yet, it's "squeezing" on its own. (Likely it was impossible for the puppet to properly squeeze it, so they had it rigged to squeeze on its own.)

TedStixon

Revealing mistake: When Chucky is walking behind Tony Gardner as he's removing Tiffany's back in the VFX room, you can tell Chucky has been composited into the scene poorly. Watch his feet, and you can sort-of see that he has a slightly "wobble/slide" to his movement where the blending of the two shots didn't quite work. The lighting on Chucky also doesn't quite match the background.

TedStixon

Revealing mistake: When Glen enters the child's room in the dream sequence, look out the window behind the rocking horse. There's an odd, unnatural stream of water firing diagonally among all the rain. (Likely some sort of flub with whatever sprinkler system they're using to create the rain on the windows.)

TedStixon

Revealing mistake: When the mother slips and falls out of the bathtub, there's a very clear jump-cut while the camera is facing the side of the bathtub. Instantly between cuts, the pattern of the water droplets changes, even though it's supposed to all be one continuous, unbroken shot. This reveals that it was pieced together from multiple different takes.

TedStixon

Revealing mistake: When the father gets stabbed in the dream sequence and falls over the railing, you can tell there are multiple jump-cuts in the shot, even though it's meant to be one continuous, unbroken shot. It's especially noticeable when he lands, and several broken pieces of wood simply "appear" around him between frames.

TedStixon