Presumably you are talking about the left menu being broken and the 'Find a category' not working?
For the first, looks like you are missing a closing div for the top nav bar. Regarding the Find a category not working, I had the same issue and there was a problem in the tutorial with an extra tab that should not have been there. If I recall, the issue was in the suggest_category view and it relates to the following line:
cat_list = get_category_list(8, starts_with)
That line should not be tabbed as shown in the tutorial as the tab causes it to become part of the above else and so cat_list is not populates as expected. Have a look at the final code from the reference site: