When Ethan and Hannah are at the kitchen sink, we see them from inside and from outside of the house. From the outside, we can see their faces above the curtains, but from the inside, the curtains are above their heads.
The goof item below may give away important plot points.
When the veterinarian is euthanizing Boss Dog in the barn, she is injecting the euthanasia solution incorrectly. The solution is injected in a vein which runs from the foot towards the body. The injection would be made into the vein pointing in the direction towards the body, not towards to paw.