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I will try and help. The short answer is that such an error will probably not invalidate the document. Such clerical errors happen and the court will usually allow the party to amend it to correct it. If the clerks can find the correct case and file it anyway, they the court will usually proceed on that document.
I hope this helps.
I would not be nasty or overtly insulting, but that said, if you have issued that need to be raised with the court, do so. Don't use 4-letter words or make wild accusations, but so long as you raise real issues that the court should be aware of and that bear on the case, nothing is really off limits.