For example this head:
https://www.brickowl.com/catalog/lego-setam-head-safety-stud-89782 The beard is not squared off on the bottom outside corners, rather they slant inwards.
Another example:
https://www.brickowl.com/catalog/lego-yellow-minifigure-head-with-eyelashes-and-big-smile-safety-stud-93396 The right eyebrow should be raised slightly higher than the left eyebrow.
I mean it's possible the ones I have are misprints, but on both of those ones I have more than one so unless they just misprinted a LOT... mmm... yeah, better to look at an actual picture I think.
-edit-
Yeah, just found a picture of the snow boarder:
https://www.brickowl.com/catalog/lego-snowboarder-set-8803-5 You can easily see the right eyebrow is raised higher, which isn't what the render looks like.
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On the plus side, in general nondecorated element renders are pretty accurate - which is a huge plus for all of us as sellers (pretty pictures on our storefronts <s>).