I have found 4 duplicate pages in Ancestry’s online version of the 1850 Lawrence County, Census images. This duplication is redundant in their online index, thereby duplicating the names of 168 Lawrence County, Mississippi residents. The affected pages are:
page 62 duplicated on 66
page 63 duplicated on 67
page 64 duplicated on 68
page 65 duplicated on 69
Pages 65 ends with household 470, while page 70 begins with household 470. There are no missing pages, only duplicated ones.