Other mistake: She's holding a Beretta M1951 9mm single action semi-automatic handgun equipped with a suppressor. She takes a shot, and the hammer is full forward. For the gun to fire the hammer has to be all the way to the rear, and after it's fired, the slide would eject the spent cartridge and grab a new one and the hammer would be to the rear. It's not a cowboy revolver where the hammer has to be cocked every time to fire. (00:54:00)
Other mistake: When Jim, Selena, Frank and his daughter enter the supermarket, you can notice all the fresh produce (apples, carrots etc) looking fresh. This virus has been going on for a few days now, and supermarkets get their fresh produce out immediately. After 10 days or so, give or take, the fresh produce shouldn't be looking this fresh. (00:46:00)
Other mistake: When Emery awakens from his nightmare his clock reads 1:20 a.m. But in the following shot, a grandfather clock in the hallway strikes 2am, but its hands are at 12:00 am.