Places where there is "Mojang" instead of "Mojang Studios":

• minecraft.net every page footer
• https://www.minecraft.net/en-us/login "Use your Mojang account..."
• https://checkout.minecraft.net/en-us/store/minecraft/#register "Create your Mojang account"
• aem-stage.minecraft.net every page footer
• loadtestperf.minecraft.net every page footer
• api.mojang.com Application-Author, Application-Description, Application-Owner
• auth.mojang.com same as the one above
• blockbyblock.mojang.com about page (7 times), resources (3 times)
• blog.mojang.com text (2 times), sidebar, footer copyright text, HTML head title
• crownandcouncil.mojang.com footer copyrigt text
• open.minecraft.net footer copyright text
• help.minecraft.net Mojang accounts category
• help.minecraft.net Mojang category
• help.minecraft.net footer copyright text
• feedback.mojang.com footer copyright text
• feedback.minecraft.net FAQ (8 times)
• minecraftshop.com footer copyright text
• education.minecraft.net footer copyright text
• dungeons.minecraft.net footer copyright text
• https://www.minecraft.net/en-us/store/minecraft-dungeons-windows "Mojang! The first stand-alone game developed by Mojang..."
• callersbane.com footer created by text
• playcobalt.com sidebar mojang link
• playcobalt.com sidebar "OSX & Linux?"
• https://www.microsoft.com/en-us/download/details.aspx?id=49499 "Minecraft or Mojang" and filename of downloadable content
• https://www.microsoft.com/en-us/p/minecraft-for-windows-10/9nblggh2jhxj?activetab=pivot:overviewtab copyright above footer (also appears with other editions)
• account.mojang.com terms and conditions -> full terms:
  • Mojang Account Terms
  • Brand And Assets Guidelines
  • Commercial Usage Guidelines (23 times)

Places where there is the old Mojang logo instead of the new one:

• aem-stage.minecraft.net footer
• open.minecraft.net footer
• blog.mojang.com favicon.ico
• blog.mojang.com header
• crownandcouncil.mojang.com favicon.ico
• jobs.mojang.com navbar
• help.minecraft.net favicon.ico
• help.minecraft.net footer
• feedback.minecraft.net footer
• dungeons.minecraft.net footer
• playcobalt.com footer "in collaboration with"
• account.mojang.com favicon.ico
• account.mojang.com navigation bar
• crowdin.com "Trusted by successful businesses around the globe"
• The Mojang capes...

Note: I searched for these over a big window of time so some may have already been fixed. Also, I may have missed a few.