I like this article but #6 the wrong platform is a rare mistake and not worth including on this list. Good programmers can figure this out without much trouble.
I worked for this company who implemented a product in Delphi. They knew it was the wrong but the fastest way to get the product to the market. After making a big profit the time came to rewrite the product and everyone knew that C++ was the way. Because of political manipulations Delphi was chosen again and it was back to square one after few months of development.
Wrong platform is a common mistake...