Where can I have a look at all users registered?

I would like to view the list of all users to check for inconsistencies, correct spelling, etc.

You can find the list of all registered users here:
Overview => User and Participant Management => List of All Users

You can use any of the filter option to look for a particular subset of users or use the search field to find specific users.
In case you come across an error or want to add further details, in the column "Action" on the right click on "Edit User" to edit the user data.

You can also export all users to process them for instance in Excel, if you prefer.
Please go to:
Overview => Data Import and Export => Export Data
... and choose the option "Export Registered Users".