Nothing’s perfect. 
The title’s pretty self explanatory. It can be an actual mistake, or something that was technically done right but that you personally are just bothered by.
I’m nitpicky, so I have a lot of these, but I’ll just put down a couple for the OP;
-
During the whole “You are a cool toy” speech an entire sunrise passes over the course of like two minutes.
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I could write a very long essay on the various reasons why I dislike “Randy’s” glasses.
(And a little disclaimer: This is not meant to imply anything negative about the movies [unless you want to 
]. It’s just a thread to put down anything small that might be nagging at you.)