During the Belated Justice quest, if you go upstairs and speak to Caecalia Victrix before going to the jail and getting entrance from Gaulus the Jailor and speaking to the general, the dialogue for entering the jail never appears with Gaulus. You can speak with him about the general and he will tell you which cell he is in, but he will not give you the keys or open the door since the initial dialogue choice never fired.

If you use the console to unlock the doors and get into the cell, then the general will act as if you already spoke and refused to hear him out, skipping a chunk of the quest and potentially breaking it.