diff --git a/Library/Homebrew/build.rb b/Library/Homebrew/build.rb
index fb846784fa..5826a86430 100644
--- a/Library/Homebrew/build.rb
+++ b/Library/Homebrew/build.rb
@@ -127,7 +127,7 @@ class Build
         end
         if ARGV.interactive?
           ohai "Entering interactive mode"
-          puts "Type `exit` to return and finalize the installation"
+          puts "Type `exit` to return and finalize the installation."
           puts "Install to this prefix: #{formula.prefix}"
 
           if ARGV.git?
diff --git a/Library/Homebrew/cleaner.rb b/Library/Homebrew/cleaner.rb
index 3f5e3aa377..9ff56ce26c 100644
--- a/Library/Homebrew/cleaner.rb
+++ b/Library/Homebrew/cleaner.rb
@@ -111,7 +111,7 @@ class Cleaner
         end
         if ARGV.debug?
           old_perms = path.stat.mode & 0777
-          puts "Fixing #{path} permissions from #{old_perms.to_s(8)} to #{perms.to_s(8)}" if perms != old_perms
+          odebug "Fixing #{path} permissions from #{old_perms.to_s(8)} to #{perms.to_s(8)}" if perms != old_perms
         end
         path.chmod perms
       end
diff --git a/Library/Homebrew/cmd/commands.rb b/Library/Homebrew/cmd/commands.rb
index 87c5cc44bc..c18f254e5b 100644
--- a/Library/Homebrew/cmd/commands.rb
+++ b/Library/Homebrew/cmd/commands.rb
@@ -35,21 +35,18 @@ module Homebrew
     end
 
     # Find commands in Homebrew/cmd
-    puts "Built-in commands"
-    puts Formatter.columns(internal_commands.sort)
+    ohai "Built-in commands", Formatter.columns(internal_commands.sort)
 
     # Find commands in Homebrew/dev-cmd
     puts
-    puts "Built-in developer commands"
-    puts Formatter.columns(internal_developer_commands.sort)
+    ohai "Built-in developer commands", Formatter.columns(internal_developer_commands.sort)
 
     exts = external_commands
     return if exts.empty?
 
     # Find commands in the PATH
     puts
-    puts "External commands"
-    puts Formatter.columns(exts)
+    ohai "External commands", Formatter.columns(exts)
   end
 
   def internal_commands
diff --git a/Library/Homebrew/cmd/doctor.rb b/Library/Homebrew/cmd/doctor.rb
index bcb718b2cc..4494dee7fb 100644
--- a/Library/Homebrew/cmd/doctor.rb
+++ b/Library/Homebrew/cmd/doctor.rb
@@ -50,7 +50,7 @@ module Homebrew
 
     first_warning = true
     methods.each do |method|
-      $stderr.puts "Checking #{method}" if args.debug?
+      $stderr.puts Formatter.headline("Checking #{method}", color: :magenta) if args.debug?
       unless checks.respond_to?(method)
         Homebrew.failed = true
         puts "No check available by the name: #{method}"
diff --git a/Library/Homebrew/dev-cmd/bottle.rb b/Library/Homebrew/dev-cmd/bottle.rb
index 6f8645120f..0a3c33128d 100644
--- a/Library/Homebrew/dev-cmd/bottle.rb
+++ b/Library/Homebrew/dev-cmd/bottle.rb
@@ -172,7 +172,7 @@ module Homebrew
       end
 
       if text_matches.size > MAXIMUM_STRING_MATCHES
-        puts "Only the first #{MAXIMUM_STRING_MATCHES} matches were output"
+        puts "Only the first #{MAXIMUM_STRING_MATCHES} matches were output."
       end
     end
 
diff --git a/Library/Homebrew/dev-cmd/create.rb b/Library/Homebrew/dev-cmd/create.rb
index 42045c48cb..9c56aa8f16 100644
--- a/Library/Homebrew/dev-cmd/create.rb
+++ b/Library/Homebrew/dev-cmd/create.rb
@@ -121,7 +121,7 @@ module Homebrew
 
     fc.generate!
 
-    puts "Please `brew audit --new-formula #{fc.name}` before submitting, thanks."
+    puts "Please run `brew audit --new-formula #{fc.name}` before submitting, thanks."
     exec_editor fc.path
   end
 
diff --git a/Library/Homebrew/dev-cmd/extract.rb b/Library/Homebrew/dev-cmd/extract.rb
index f1a5c39c8c..65ecef960e 100644
--- a/Library/Homebrew/dev-cmd/extract.rb
+++ b/Library/Homebrew/dev-cmd/extract.rb
@@ -135,14 +135,14 @@ module Homebrew
         file = repo/path
         result = Git.last_revision_of_file(repo, file, before_commit: rev)
         if result.empty?
-          ohai "Skipping revision #{rev} - file is empty at this revision" if ARGV.debug?
+          odebug "Skipping revision #{rev} - file is empty at this revision" if ARGV.debug?
           next
         end
 
         test_formula = formula_at_revision(repo, name, file, rev)
         break if test_formula.nil? || test_formula.version == version
 
-        ohai "Trying #{test_formula.version} from revision #{rev} against desired #{version}" if ARGV.debug?
+        odebug "Trying #{test_formula.version} from revision #{rev} against desired #{version}" if ARGV.debug?
       end
       odie "Could not find #{name}! The formula or version may not have existed." if test_formula.nil?
     else
@@ -181,7 +181,7 @@ module Homebrew
             brew extract --force --version=#{version} #{name} #{destination_tap.name}
         EOS
       end
-      ohai "Overwriting existing formula at #{path}" if ARGV.debug?
+      odebug "Overwriting existing formula at #{path}" if ARGV.debug?
       path.delete
     end
     ohai "Writing formula for #{name} from revision #{rev} to #{path}"
diff --git a/Library/Homebrew/formula_versions.rb b/Library/Homebrew/formula_versions.rb
index ae1c670637..a30313846c 100644
--- a/Library/Homebrew/formula_versions.rb
+++ b/Library/Homebrew/formula_versions.rb
@@ -44,7 +44,7 @@ class FormulaVersions
   rescue *IGNORED_EXCEPTIONS => e
     # We rescue these so that we can skip bad versions and
     # continue walking the history
-    ohai "#{e} in #{name} at revision #{rev}", e.backtrace if ARGV.debug?
+    odebug "#{e} in #{name} at revision #{rev}", e.backtrace if ARGV.debug?
   rescue FormulaUnavailableError
     nil
   ensure
diff --git a/Library/Homebrew/os/mac/keg.rb b/Library/Homebrew/os/mac/keg.rb
index 65d4ceb029..9cf35e39d9 100644
--- a/Library/Homebrew/os/mac/keg.rb
+++ b/Library/Homebrew/os/mac/keg.rb
@@ -5,7 +5,7 @@ class Keg
     return if file.dylib_id == id
 
     @require_relocation = true
-    puts "Changing dylib ID of #{file}\n  from #{file.dylib_id}\n    to #{id}" if ARGV.debug?
+    odebug "Changing dylib ID of #{file}\n  from #{file.dylib_id}\n    to #{id}" if ARGV.debug?
     MachO::Tools.change_dylib_id(file, id, strict: false)
   rescue MachO::MachOError
     onoe <<~EOS
@@ -20,7 +20,7 @@ class Keg
     return if old == new
 
     @require_relocation = true
-    puts "Changing install name in #{file}\n  from #{old}\n    to #{new}" if ARGV.debug?
+    odebug "Changing install name in #{file}\n  from #{old}\n    to #{new}" if ARGV.debug?
     MachO::Tools.change_install_name(file, old, new, strict: false)
   rescue MachO::MachOError
     onoe <<~EOS
diff --git a/Library/Homebrew/os/mac/xcode.rb b/Library/Homebrew/os/mac/xcode.rb
index 355cfd9926..453f5c2416 100644
--- a/Library/Homebrew/os/mac/xcode.rb
+++ b/Library/Homebrew/os/mac/xcode.rb
@@ -236,7 +236,7 @@ module OS
           EOS
         else
           <<~EOS
-            Update them from Software Update in the App Store
+            Update them from Software Update in the App Store or
             #{Formatter.url("https://developer.apple.com/download/more/")}.
           EOS
         end
diff --git a/Library/Homebrew/resource.rb b/Library/Homebrew/resource.rb
index 9998b50ca5..0ab0085cfa 100644
--- a/Library/Homebrew/resource.rb
+++ b/Library/Homebrew/resource.rb
@@ -132,7 +132,7 @@ class Resource
     end
   rescue ChecksumMissingError
     opoo "Cannot verify integrity of #{fn.basename}"
-    puts "A checksum was not provided for this resource"
+    puts "A checksum was not provided for this resource."
     puts "For your reference the SHA-256 is: #{fn.sha256}"
   end