Not sure if this is new, and I meant to post this quite awhile back, but it's possible to get up to the 4th floor of the mansion without having to quickly switch to your dungeon-dwelling party member. It only happens rarely, and most of the time it fails, and triggers Dave's dialog about not being able to get past the green tentacle. But occasionally, I've had it let me slip by. This saves a few seconds in screen transitions, but I haven't found a consistent way to get it. If anybody does, let everyone know. :)