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Hey Travis, 404 status codes pages are soft errors but causes problems if you have large number of 404 pages.  I would suggest to use screaming frog to list up all your 404 pages and redirect all 404 pages to newly create corresponding pages. This is the best solution ever seen and could boost your trust rank, site performance and indexing.

moreover, If error is associated with WP plugin, then better to deactivate it or use SEO Yoast, as said by Michael Edwards.

Hello Ashish, indexing and caching of pages depends upon many factors :-

(1) dynamic nature of website (2) frequency and priority of webpages in XML sitemap (3) posting of webpages in G+, twitter and other social sites, freshness and uniqueness of content and lastly how popular your website.

Its good new that Google is crawling website quickly just because of hard work associated with your work.

65% bounce rate is too much. Bounce rate directly depends upon session, session% and number of page view per visit. If you any particular visit in Google analytics, bounce rate shows lesser for visit with good number of page views. Hence more page visit per visitor, lesser bounce rate.

To decrease bounce rate, use more related links and images to landing page. Additionally, use of images and inforgraphics can drastically lower down bounce rate and hence good keyword ranking.

thanks and cheers