When Granny is serving coffee to 'The Ancient Ones' motorcycle gang, the level of coffee in the pot increases before she pours the first cup.
The amount of dirt and blood on Tina's face and hair constantly changes between shots, from a lot of dirt and blood to some dirt and blood, to none at all.
When Tina is smashing everything in the Creator's lair, for a couple shots you can see her wearing safety goggles.
While Tina is fighting a monster, look at the Creator in the background. You can clearly see the actor's neck. The Creator is supposed to be headless.
When Tina tries to escape from the newspaper covered room, the "metal" bars on the window flex.
When Plates is "balancing" plates, they are paper plates glued together.
In a scene where Tina tries to escape she climbs up a ladder, as you see her climb out of the hatch at the top a hand can be seen pushing her up and out.
After Tina escapes through the floorboards in the newspaper covered room, she ends up in the shop, during this time you can see a crew member in the background.