Post Page is showing invalid items

Please do the following:

1. Go to brassaddiction.com.
2. Click the "Blog" link in the upper right menu.
3. Select the item "Deercreek Holiday Party".
4. Scroll to the bottom of the page.

Issues:

1. There is a link to "Photo Gallery." What is this? How do I suppress it?
2. The previous link that shows is to "Hello World." This post is not the same category as the posts in the list that I'm using. How do I force the "previous" and "next" post to only be the same category as the one being viewed?
3. There's a "Leave a Reply" section. How do I suppress this?

Thanks.