That's funny, I thought it [the "wrong address" banter] went:
PC: "Oh, hi, is this the House of Kangaxx's Torso?"
Shangalar: "No, this is the Twisted Rune. You want next door."
PC: "Oh, sorry. Thanks."
Shangalar: "No problem."
two minutes later....
PC: "Hey, sorry to bug you again, but he's got a sock tied to his doorknob. Mind if we just wait here until he's not busy anymore?"
Shangalar: "Sure, we're just watching the playoffs. It's BYOB, though."
PC: "That's cool, Korgan brought some."
Dundee, you forgot the Githyanki ambush on the list of Bad Things to Happen. Although, come to think of it, you can't get Kruin and the Vampires in the same chapter.....but you CAN have Nalia get abducted right before you need her.
But, the funny thing is, even if you DO get waylaid by 6 groups at the same time like that....all you have to do is have everybody drink one of the Potions of Invisibility that every party member should keep permanently stored in their third Quickslot, for situations just like this. Amazing how that one little move immediately turns the tide in your favor.