>>40650302
Very easy
Let us assume for the sake of this argument that this 'alien' is a biological organism just like us humans (because if not, then what are its fucking eyes and mouth for?)
When the flashlight was shone through the ayy's eyes, we should be able to observe a phenomenon called subsurface scattering (see picrel), because all real complex-eyes (and not pseudo-eyes like those of primitive animals) must be translucent to some degree to allow the passage of light. But we did not, because that thing is a puppet made out of acrylic resin.
>https://en.wikipedia.org/wiki/Subsurface_scattering