Ah thanks. I either didn't know that or I tried it and it didn't really help. I'll take a look at it again on my next long trip.

But basically I'd like TripIt to flag possible problems rather than have me depend on eyeballing it--even though that works OK most of the time.

The printing out of calendar pages is more for trip planning. TripIt doesn't (and isn't really intended to do) anything along those lines.