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Firstly, it adds @Override to hiding (but overriding) static methods, which is wrong; I remember that getting fixed in Mustang, so in fact it will cause compiler errors. Secondly, if the declaration already has @SuppressWarnings("unchecked"), say, then adding @Override makes the result looks like: @SuppressWarnings @Override("unchecked") which isn't correct either.
The first problem does in fact show up as an error in Jackpot, since it uses the Mustang compiler. However, the static flag is now checked regardless, because currently Jackpot allows errors. The second problem was due to javac's parser not reporting the end positions of annotations with parentheses correctly. The problem has been reported along with a patch which is now in Jackpot's parser.