Criteria for Backlinks showing up on Google

[rshandy]

I only see a portion of my backlinks show up in Google. Many are PR4 and above but still do not show up in the backlinks.

I searched the forum and found an old discussion regarding the slash after the url i.e. www.mydomain.com vs. www.mydomain.com/ saying that Apache will return a 301 redirect without the slash.

If that's true, then would it make sense for all inbound links to have the slash included, including interior pages pointing to other pages within the same site?

In addition, does the slash determine whether a link will pass PR or not or is there some other factor(s)?

Thanks.