I don't know exactly how it works, but the page shows animations over the ticket information, these could be customizable or rotated during the event by the event organizer making them very difficult to fake.

Yeah. Just dreaming, but it would be cool if the event organizer could use their phone's camera aimed at the guest to face recognize them and match them to the db of guest snapped pics. Would be too difficult to get required accuracy right now, but maybe in future.

You bring up a valid point. Presenting a picture as the only means for authentication removes the benefit of digitized confirmation. Pics on the app store link appear to show a clock of some sort over the picture, but even that could be easily recreated.

You could add a visual icon as a sort of two-factor authentication. Set the icon to change every few minutes and do a push notification with the current icon to the people at the door.

There are indeed a couple security features. Answered here: https://news.ycombinator.com/item?id=7277671