Totally embassy-specific, and unsurprisingly, person specific, as there are reports of people being approved with only a one month statement while others are required three, on the same embassy. It seems to be a "dynamic" rule. Said so, you shouldn't have problems if it's been seasoned for at least three months.
well, it depends. Many embassies do require a real ticket + accommodation booking confirmation. Sure you can upload a dummy ticket, but your application can be rejected. The best approach is to book a fully refundable ticket or one with no penalties for date changes.
Participante anónimo 337 your passport country DOES matter. The embassy website states some countries are subject to stricter vetting and longer processing times.