In the opening credits, the name of Kyle Richards' character is spelt as "Lindsay" instead of "Lindsey".
When Michael tears his hand off the knife stuck in the table, the knife handle is clearly missing. Moments after, as Frank gets into the house, there's a shot of the kitchen with Laurie and Allyson standing, and Michael lying on the table. The knife has a handle again.
In the end when they transport Michael's body to the industrial shredder at the junkyard, this could have been designated as an excessive use of deadly force. Not only could the civilian participants suffer criminal penalties, but the law enforcement officers could have been held accountable as well for allowing it.
As Corey is sitting on the couch babysitting, his shoes change to a gray pair and then back to stripes.
Though police response times in large areas are famously not fantastic, the police take nearly 20 minutes to get to Laurie Strode's house on Halloween Night in the suburban town of Haddonfield.
There was really no reason for Michael to be wearing his mask while hiding in the sewer.
When Michael Myers attacks Nurse Deb, stabbing her through the painting, the wires holding her up are visible.
This movie takes place in Haddonfield, Illinois. In one scene, there is Publix brand milk in the refrigerator. There are no Publix stores in Illinois.
Halloween Ends is supposed to take place four years after the events of Halloween Kills. But it's never really established why Michael didn't simply continue his killing spree immediately after the events of Halloween Kills. It also seems that, if he wasn't going to start immediately, he would have resumed the following Halloween instead of waiting four years.
After Laurie kills Michael during their final fight, it's never really established how word got around so quickly that the citizens of Haddonfield lined the streets and proceeded to the junkyard to watch his body being disposed of in the industrial shredder.
One of the teen bullies refers to their convertible as a LeBaron. The vehicle is actually a Dodge 600.