Once upon a time there was the presentation of the first Maemo device to the employees. The feedback about it becoming an hit if GSM support was added, was just ignored.

Very few also had the opportunity to see a Nokia 7710 live besides us, as it was quickly killed after a few months on sale.

Also the famous blog post about how shitty Symbian C++ was, that only Nokia employees would be willing to use it.

Some years ago The Register had a pretty good report about the internal politics going on there.