Mask details:

1. Look at corner of eye and thickness of skin bottom and corner of eye. These masks fit snuggly, but bottom of eye still looks a touch too thick. Corner of eye issue noticeable on Tom Cruise mask in latest movie in several closeup scenes.

2. Eyelids, especially on blink will be noticeably detached from eyebrow (seen on Lindsey Graham's and Maxine Waters' masks frequently). Key interface is real eyelid with fake eyebrow. Sometimes pigment variations noticeable.

3. Age of the eye of the mask-wearer may look/move/react at a speed that does not match the age of the person being impersonated. Yes, eyes can be dated to some extent (also eye color fade/mismatch with person being portrayed). "Hillary's eyes" look like those of a person 35-50, not her age.

4. Ear/earflap mismatch or poor fit. This was most common issue on Biden mask. Apparently, there is mask variation that uses actor's ears, possibly with mini-prosthetics outside of mask to make it look more authentic. Mask is then "glued" to the ear prosthetics via tiny "flaps" that go into the prosthetic ear hole.