This puzzle is topsy-turvy. Normally one would expect to get the theme via the clue gimmick provided, but in this case the number of possible changes to extra words is too large to be of any use whatsoever. Many have eight or more possibilities and at least one has over twenty. As far as I can see the correct versions can only be determined when one has worked out the theme from the completed grid, and even then I fail to see how a couple are particularly thematic.
The endgame misspelling strikes me as a bit silly. I can't see that it adds to the puzzle, especially as it's thematically inappropriate since it should apply to the occupant, not the origin.
Still, an enjoyable puzzle that was rather easier to complete than last week's.
My tip to anyone who has only just started the puzzle is don't waste your time trying to see what the misprints might be. Just fill the grid first. The system for entering overlong answers can be worked out without the hint (as somewhat unhelpful hint in any case).