• During the quest where the two Argonian "slaves" were supposed to "follow me to town", when they attacked me, I got a 100 septim bounty.
• During the finale of the quest, when Simeth is supposed to follow you to serve as back-up, when exiting the tower he patrols from through the ground-level exit, he exits through the top-level hatch. (I couldn't even use console commands to position him where I wanted him. I had to go it alone.

Bonus: While in the catacombs, there is a door that is supposed to be blocked by a rockfall. It was all too easy for me to squeeze through the rockfall.