A sentry was alerted, so I immediately activated the switchboard operator. Then I kept getting the Sentry Alerted message and hearing the ringing noise, alternating between the two different rings, while the sentry was standing in one place or moving slowly. After a while this stopped and the sentry suddenly turned around and opened fire. After escaping the area (the objective was to sabotage the dump in the garbage racket) the sentry's map marker turned white as if he'd called in reinforcements, even though he never got to the phones.

In the garbage racket, after interrogating the informant, I drove towards Di Napoli Hazardous Storage to steal the money stash. As I got close I decided to wiretap that section of Barclay Mills, so I continued on to the junction box. When I returned to the hazardous storage site there were no cleaners there, in fact no enemies whatsoever.

I didn't do the Who We Shootin'? conversation with Donovan right after it was unlocked, and after meeting Donovan at the hotel the second time the motel became inaccessible and disappeared from the map.

It's possible that this will be a building featured in the Sign of the Times DLC.

This happens every time I have a cutscene with Donovan at the motel when that conversation hasn't yet been completed. Immediately after the cutscene, I'm able to enter Donovan's motel, but it no longer behaves like a safehouse (i.e. Lincoln has full abilities inside, though he still closes the door) and the icon disappears from the map. After the next sitdown the motel returns to normal and the conversation unlocks again.

It seems like they might have partially fixed this, as the time change happens normally unless I approach the land from right up by the lighthouse. If I do that I stay in slow motion for a while, but it seems like it goes back to normal after I open fire.

After starting the game while doing the black market racket, I found two enemy vehicles sitting in the middle of the road. Killing the enemies inside did no damage to the racket.

Those are part of the "Steal back Grant's truck" objective. They will form a roadblock then chase after you when you deliver the truck back to Grant. Not sure why they appear before you start that objective, but they always do.

I've never seen them form an actual roadblock though, they always spawn in front or behind me and then start chasing after me when I get close.

The "kill the kinky VIPs" objective in the French Ward sex racket was causing problems for me again. First, at some point while I was killing them, the wiretapping feature totally disappeared from the map. After completing the racket damage I reloaded the game and wiretapping went back to normal, but then I encountered several other bugs. After I exited the bar I noticed certain sounds were muffled, and I finally figured out this was the same as when Intel View is activated. So I activated Intel View, and after that the sounds went back to normal. Finally, when I went back to Un Belle Jardin to confront Handsome Harry, the enemies there didn't spawn until I entered the complex and was right next to one of them.