In Reed's prologue, there's a sudden change in the name from Reed to Isaac when Reed was talking to Francis in the graveyard. Its a minor one (only 2) so I guess the tester didn't noticed them before. Not only in my playtrough but I've seen it as well with Youtuber who let's play as Reed.
(I cant attach an image in here cause the size is too large)
Here is the sudden change from Reed to Isaac moments :
Also, at this point, this is just a ramble one, but I hope you guys tolerate this :
So in Reed's prologue, in the scene where Reed meets Isaac for the first time, it would be best to named Isaac as a 'noble' first, instead of straight-to-the-point 'Isaac', if u guys know what I meant. It's to make the scene to have that shocked moment at the end (cause of 'that letter') instead of -- we already know what's going to happened cause the devs already put his character named Isaac from the start of the meeting -- that kind of situation.
See the letter : http://imgur.com/Dxyphrg
So instead of addressing him as Isaac already, why not named him first as 'noble' maybe. Then the letter at the end would be more befitting to end the prologue of Reed cause there's 'Isaac' in that letter. I hope you understand and thanks for hearing me out. You guys did an awesome job on this