You really shouldn't have any unexpected 404 "Page Not Found" responses. Turning off the PageCheck/VerifyCompleteTitle may stop the error msg., but you should understand why you are getting the 404 response.
Rarely are 500 "Internal Server Error" responses valid in my experience.
Most likely these errors are valid and probably related to dyanmaic values that you need to parameterize.
A problem is a difference between what is perceived and what is desired, that
we want to reduce (Dewey 1933)