"usr/lib/nslookup.help" is installed with mode 600, this causes the help option of nslookup to fail with permission denied. Changing the mode to 644 fixes the problem. The bindutils package for RedHat 7.0 is bind-utils-8.2.2_P5-25.
nslookup comes with bind-utils created from bind source rpm), not binutils. Reassigning.
This has been fixed in 9.0.0.