POSSIBLE SPOILER - ADVANCED APOLOGIES!
Hey has anyone else discovered or done this yet? When running to the keep at the beginning of the game during the dragon attack, I accidently went into the first door I came to instead of the second one where you meet up with the imperial guy. While I was in there a Storm Cloak guy came in and started talking to me in the same manner as the imperial does......he even cut my ropes off! Then he told me to loot a nearby body to get my gear. After that he checks the doors and seeing that they are locked he says that we need to find a key. As soon as he says that, 2 imperials came charging down the locked passage and opened the door and him and I went about killing them and got a key lol! Then we started our escape and it was there I notice everything is in reverse. The imperials are now the enemy lol!
Anyway I never knew you could do that haha! When I first played I just assumed that first door was locked so I just ignored it and ran to the one where you meet up with the imperial guy. Who knew.......obviously not me!