If you can type quickly make certain that at some point in time you actually read the document that you've transcribed. Fast typists sometimes don't always comprehend what they are typing--at least I don't. A recent document indicated at the end how the person signing the document was related to another individual.
When I re-read the original document again that phrase had been used twice in the document. My transcription was correct and I had typed the relationship twice. But I certainly did not remember that first reference although I obviously read it.
Think about it after you type it and make certain something didn't just pass through your mind without being retained.