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Here's a continuity error, but it's a simple one that happens in all films:
Luke goes out the window in the air shaft on Bespin and falls down towards the platform below, in which he has to grapple the side of the walkway to stay from plummeting to his death. Both hands, holding tight on the walkways. Where does his lightsaber go and how does he get it back in the next scene?
You know, I've always wondered about that. I always thought I saw it clipped to his belt, but last time I watched it, I didn't see it. Maybe it is, and we have to assume it's one of those Force things. If it isn't, maybe it landed somewhere off camera but still on the platform for Luke to retrieve it.
As for Lando, he had already decided to rebel once Vader gave his, "Pray I don't alter it any further" line. Notice how he looks at Lobot right then? The way I interpreted it was that he then sent Lobot to wherever it was that he was when Lando communicated with him via watch. He had been sent ahead to get those guard ready to overtake the storm troopers. So it was Lando finally getting fed up with being used that caused him to put his plan into motion. I'll say that it wasn't Luke's presence that caused Vader to be distracted but that he was supposed to come. I think even if Luke had been later in coming (it's simple movie convenience that Luke showed up just late enough for Han to be lost but just in time to see Leia and later be saved by her), Vader still would have waited for him. Even if Luke had never showed up at all, Vader would still be waiting for him. He had no way of knowing for sure (until he was told or was able to sense him) if Luke would show up or not. Just like Yoda couldn't see into the future completely accurately, I don't think Vader could either.