Originally Posted by
moondog
I don't know of any countries that match exits to the proof of onward travel. It's quite common to change plans over the course of 30/60/90 day stays.
Most don't (unless you get into a situation where you have to provide ID to the authorities). But with border controls tightening (and ETA/ESTA/ABC123 becoming common) don't be surprised to see it. Of course things can always change... but with technology, tracking is becoming more and more common. (of course some kinda used to do it manually.... such as China)