Oof. I followed the lecture closely and then even downloaded the correct scripts off the repo, but still had a lot of bugs. The coordinate labeller was only showing (0,0), for example.
So I had to revert to a previous version. NBD.
But I expect it had something to do with changing making a slightly hot edit to Waypoint, renaming it Tile, and doing all that.
It worked much better on my second attempt where I removed Waypoint first, then added Tile. Yes, I had to go change a few references here and there, but it seemed to give my game fewer germs.
Your mileage may vary, of course 
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