404 errors since redirecting DNS to Bluehost from GoDaddy

Hello,
Last night Nastia was fabulous and helped me redirect the DNS to point the hosting of my website back to Bluehost. There had been no changes to the site and I'd kept the hosting. She also told me that I should check when the changes had happened by using this URL http://dnscheck.pingdom.com/?domain=www.executivewisdom.com -- The test shows it's all fine. No errors. But I am getting 404 errors on certain pages of my website. Can I receive some guidance on what I must look for to stop the 404 errors, please? Thank you.
Ric