The first two are easily explained - take another look at my article about transcription errors.
The ED code wouldn't have been transcribed - it's meta data - so it's not a transcription error. And you can't search on it anyway, so it wouldn't matter if it was wrong or missing.
The last error is the only one for which the transcriber might be held responsible, but I'd need to see it to be sure. On the basis of what you've said it sounds as if the transcriber thought that Sea View was the name of the road, whereas it was actually the name of a house.
Thank goodness the poor transcribers have got me to defend them!