1. Navigation / Menu bars
Most of us who have browsed sites with navigation bars on smart phones or tablets have faced this problem that menus doesn’t work very well on these smart devices. This is because there is no mouse to hover on the menu bar.
Please read our “How to design Navigation/Menus for responsive designs”
2. Layout options
While designing different layouts for a responsive design, the element placement have to be carefully thought on. If there is a right side bar on a page which has the most important links on the website, moving such links to bottom on a mobile layout might lead to a higher bounce rate of the visitors.
3. Dynamic & Flexible Widgets
There are a number of widgets available these days which can be included in the layout with relative ease. These widgets can distort the layout if not carefully thought of.