1) Incorrect formatting of the book author's name. See, e.g., B. 15.1(a) ("The first time a work is cited, always give the author’s full name as it appears on the publication, . . . ").
2) Misusing "et al." with the authors' names. See, e.g., B 15.1(b) "More than two authors. Use the first author’s name followed by “et al.” when saving space is desired and in short form citations. List all of the authors’ names when particularly relevant . . ."
3) When there are two authors, using incorrect order of authors' names and using "and" instead of an ampersand. See, e.g., B 15.1(a) ("List the authors’ names in the order in which they appear on the title page, separated by an ampersand . . . ).
4) Incorrect capitalization of prepositions in the book title. See, e.g,. B 8(a) ("Do not capitalize articles, conjunctions, or prepositions when they are four or fewer letters, unless they begin the heading or title, or immediately follow a colon."). This rule applies (usually) even if the book's actual title is capitalized differently. See B 15.3 (Cite the full main title as it appears on the title page, but capitalize according to rule 8 (unless the title is not in English, in which case follow rule 20.2.2(b)).
5) As of the latest version of the Bluebook, publisher information is no longer required (with the exception of R15.4 where publisher information is included to distinguish the work in certain scenarios.)