Indeed, it is not the first time someone stumble upon the mouse object needing to be added.
This topic will let Ash know that it needs a bit tweakening.
And to answer yes, Mouse is like any other object and need to be manually added to the project if you are willing to use it. This happens on MAC and PC alike, as harrio said, nothing to see with the specific gear.
EDIT: Going through the tutorial, Page 2, you have "Add the input object" where it is asked to add the mouse to the layout. (and keyboard too)
The tuto doesn't need tweakening apparently, it just need to be read and followed from start to end ^^