Hello Xia,
Thank you for your questions. It is always better to ask when you need clarification.
2.4.1.b refers specifically to information that would normally go on the title page, but because there is not enough room, it will not fit. The cell five heading would apply to headings such as Authors, Editors, and Consultants (if an agency requires). This heading would not apply to the title of the book.
2.17 In this situation, the bullets identify separate content entries. Since they are separate entries, they must be placed on their own line as a separate entry. The other entry is a single contents entry, which requires only one line.
2-21
The use of the colon. I believe this should be a semi-colon. The previous version of Braille Formats 2011 used a colon. However, Version 2016 updated this to a semicolon.
You are correct; based on BF2.3.5f, you would use the editor's name since no author is listed. Sample 2-21 references an editorial staff listed under the heading STAFF CREDITS FOR PRENTICE HALL LITERATURE. In this situation, it seems that the editorial staff refers to all PRENTICE HALL LITERATURE as opposed to this specific book.
The use of the (cont.) is governed by 2.10.10a, which states in part: "Insert “(cont.)” after the last listed item only. " In this example, PLOT is the last listed item. So you would not place (cont.) after SHORT STORIES.
Michael