6. Mario’s hat was not a fashion choice. Developers worked it in because they found it difficult to create the movement of Mario’s hair when he jumped.
In fact, Mario’s entire look was built to accommodate graphical and design limitations. In addition to the hat, Mario sports a mustache to accentuate his nose and wears dungarees so that his arm movements are more noticeable.
7. Major design hack! In ‘Super Mario Bros.’, the bushes are just green-colored clouds.
8. If ‘Super Mario Bros.’ played out in real life, Mario would have to run (and swim) 3.4 miles to get to Princess Peach.
Someone actually calculated this. Aren’t you glad?(source)