http://api.stackexchange.com/docs/types/answer says the can_flag field is unchanged in unsafe filters. It's probably meant for the field above it: body_markdown.
At the bottom of http://api.stackexchange.com/docs?tab=type#docs under the Member Types section, notice and related_site are on the same line. A <br> is missing between the items.
On the search_excerpt page:
community_owned_date should be marked as may be absent
locked_date should be marked as may be absent
search/excerpts should be listed in the Methods That Return This Type section