Complete article with the list of fails: Avoid These 10 UX Design FailsThe goal of UX design is to improve the customer journey through superior design. This involves the design, usability, and functionality of the overall app or website.
These ten UX design fails listed below prove that even top companies can sometimes drop the ball...
...The user experience needs to be at the forefront of your mind as you work on UX design. Superior UX design is one of the ways that small businesses are pulling customers away from larger, more traditional businesses. My final piece of advice is to make sure you are placing usability above style. While eye-catching apps and websites are still important, we live in a minimalist world where consumers place usability over aesthetics.
My 2cents: I run into this problem a lot - site forms built for American phone numbers and postal codes (zip codes) only. Maybe
a) the coders should not limit what is filled in or check entered info for American and other phone numbers and postal codes from countries you are willing to talk with (if you have to pick country from the list then a function can switch the checking process)
b) be perfectly clear you only want to talk to people of a specific country