Actually yes.. it could be deleted and replaced with this in both sticky footer examples... because otherwise for small screens there is a horizontal scroll bar..!

#footer > .container {
  padding-left: 15px;
  padding-right: 15px;
}

And 15px because it's the half of the gutter width :)

here are the fixed examples in action:
https://dl.dropboxusercontent.com/u/15234/bootstrap/examples/sticky-footer/index.html
https://dl.dropboxusercontent.com/u/15234/bootstrap/examples/sticky-footer-navbar/index.html

And an additional padding-bottom on the #wrap can help make some space between content and footer onscroll e.g.

#wrap {
  padding: 0 0 90px; /* footer height + 30px breathing room */
}

breathing room is up to the end user.. the important thing to know is that it has to be at least as the height of the footer..