Its mostly/very important how you are dressed, how polite you are etc. Mostly dreadlocked hippies in dirty clothes have a higher chance of being questioned then the well dressed and groomed.

1) 30 days is visa waiver, get a 3 months tourist visa better

2) sometimes yes, sometimes no, depends on the immigration officer

3) ok

4) no

Loads of aliens need to surrender themselves to the authorities...

Fly to Vientiane? Sorry vague question...

For you or for your wife?

FD 314 is flight KUL - DMK

Could also be luggage tags related as usually the tags are on the back of your boarding pass. Incase your luggage did not travel with you...

Immigration officers might request it or you did not fill in the arrival flight on the arrival form or just to double check you filled out the correct flight number on the arrival card.

Wild guess though...

All EU citizens do not need visas for Indo. FYI

Corrected they are actually proper tickets as you can log into the airlines website and actually see things like your seat assignment etc, they are just being cancelled after 24 or 48 hrs. Having said that I dint recommend Flyonwards - I have used them and did not receive my ticket on 1 occasion and needed Paypal to intervene to get my refund.