User blog comment:Dispelling Mage/Omake: Lucy & Migi - Review/@comment-7418318-20150831074730/@comment-7418318-20150831075656

I doubt it was a mistake. I think it was intentional to bring it better in tune with today's world, make the audience feel more in tune with the setting.

Many people today can't live without their mobile phones anymore, so seeing people who only use hard-line phones and phone boothes could disconnect such viewers from the story to a certain degree.