Errors need to be scientifically proven, not simply accounted at random. (unless we're talking about a total POS, which FLAC clearly is not).
Personally, I've not experienced a significant amount of errors in downloaded FLAC files when playing them randomly in Foobar, but then I tend to archive almost everything, and only decompress a small percentage of stuff to burn to CD. Given that, I still don't recall running into any problems with unrecoverable errors on extraction, and I'd certainly notice because it would mean that I'd have to find a replacement or trash the show (a PITA that I'd CERTAINLY recall

)
I'll also throw out the suggestion that data isn't bulletproof, and that errors happen in the most robust environments. I work with a large (30TB) multimedia ingest/playout system that despite being produced by a very reputable manufacturer, often has problems with data corruption due to a multitude of variable factors.
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