Specifically, in this diff: https://en.wikipedia.org/w/index.php?title=Lake_Washington&type=revision&diff=925521977&oldid=917060622&diffmode=source. InternetArchiveBot added almost 100 lines of debug output directly to an article, which shouldn't happen.
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I temporarily enabled debugging in wget looking for a memory leak and didn't realize stderr was redirecting to stdout - these three should be it around that time.