Some Mistakes:
1. Where’s The Search Box?
2. Poor Readability & Legibility.
3. Unorganized Content Layout.
4. Bad Navigation.
5. Inconsistent Interface Design.
6. Unfriendly Screen Resolution.
7. Complicated Registration Forms.
8. Unscrupulous Use Of Images/Animations.
9. Cluttered Pages, More Whitespace.
10. No Background Music, Please!
11. Test, Test And Test.