Thanks to Gaston for an entertaining puzzle. I found what I took to be the original warning quoted as delivered at a location different from the one revealed by the corrections but it is entirely possible that the warning was given more than once.
Very enjoyable but, as always, I had to backtrack to find all the corrections. I always feel 'correction' puzzles are better when, as here, the misprint can be in either the definition or in the wordplay.
What a brilliant puzzle by Gaston. My neighbours must have wondered what was going on so loud was my laugh when I realised what the 4 extra words created - great stuff:-)