Re: Spelling check?
"Just watch the subtitles on a popular news program to see daily demonstrations of this failure mode."
The BBC iPlayer "Super-squirrels" documentary this week had several typos in the subtitles. It probably wasn't a pure machine translation - as some words had a similar meaning but were totally different in sound and spelling.
Other typos were not even credible as misheard words - they made no sense in the context of the subtitle.