As far as the butlers going missing, there are 2 that are terrible for it. I'm really hoping its a bug, but Bertram Plunkett and Bret Marion around the second day both got the meet-up thought bubble and ran off the lot. It ended up being like many have said here that you can't call them to get them back to the lot because they say they are working and don't know when they will be finished.
I had a save just before they both were hired so I tested it some. 3 times with Plunkett, as soon as he makes breakfast on the second morning he runs off, with Marion it was around noon of the second day.
What does kinda work is locking the doors to "all but my household" once they are inside. They both got the thought bubble to meet-up once, and when they couldn't get through the door they went back to work and haven't tried to leave since, been about 3 days. I have unlocked the door and they haven't run yet, you could leave it locked but if they need to take out the garbage or recycling they just stand at the door.
Edit: Well, unlocking the door does allow them to escape after another couple days, again he tried to meet-up. I'm starting to wonder if its a bug at the lot at 272 Windsor drive, the only open lot with the vista moodlet, because I have had several games at 64 applewood (no moodlet) with butlers and never had one run off like that. I am going to test it out a little more and see.