For the non-native English speakers, or for the native but non-US speakers, this was a very interesting misspelling. A lot of native US speakers pronounce the two words absolutelly in the same way. The British pronounciation is a bit different, as I suspect to be the case in many other English speaking countries. Even in the US not everyone pronounces the 't' in "parity" the same as the 'd' in "parody", I would estimate it's about fifty-fifdy.