Unfortunately I don't have access to various Bible manuscripts, but here is an article that claims the Church Fathers had no problem changing the NT text before they were canonized. They also didn't have problem mistranslating the text after it was canonized.
Did the church fathers edit the New Testament?
Of course we've heard of the last chapter in Mark that isn't in later manuscripts. The NIV study Bible notes do mention that difference.
This article suggests that chapter 16 of Romans is an addition. My NIV Bible doesn't even have verse 24. It goes from 23 to 25.
The average Christian isn't going to know of these changes over time or if their Bible has been mistranslated on purpose.
™ Version 4.2