I see that I am late in entering into this discussion, but I will take a crack at Theodoric's early post that seemed to carry some weight.
Each reference you make is simply explained by an understanding of how the Scriptures were preserved over time: in the company of prophets. No, an original manuscript would probably not have included Numbers 12:3 and Exodus 11:3-4; these are likely scribal emendations. The anachronisms are explained similarly. A reader a millennium after the death of Moses would not have known Laish by that name, but rather by the name of Dan...so a scribe make have taken some liberty to aid his reader. These things in themselves do not authoritatively overturn Mosaic authorship, nor do they take away from the inspiration of Scripture (when properly understood as the Holy Spirit's superintending the work of human authors in their original manuscripts).
Meanwhile, as far as attribution of authorship to Moses within the canon itself, go have a look at Exodus 17:14; Deuteronomy 31:24-26; Joshua 8:31, 23:6; 2 Kings 14:6; several passages in 2 Chronicles; Ezra 6:18; Nehemiah 8:1; Nehemiah 13:1; Mark 12:26; and Hebrews 9:19.
Edited by DPowell, : Grammar.