So apparently, the Director and producer got together and decided that they would approach a hotel in the backside of nowhere in the middle of London.
As far as I can see everything was filmed inside the hotel except hilariously for two shots which were in the street outside. I'm not kidding. I checked it out on Google Maps and it's right outside the front door.
My theory is that they persuaded somebody in the hotel that this would be great PR and they all had an absolute blast running up and down and sticking badly rendered CGI in the background, in return for a few free nights accommodation, and no doubt some epic drinking sessions.
One of the highlights of the film was the flyover Dublin city. Particularly the Liffey. I think they reversed the shot in order to try and hide it but they just flipped it over. The Dublin Civic offices were on the wrong side of the river. A stock shot which they bought no doubt.
Finally, I couldn't help, but notice that several of the women look like men in drag. I have no problem with that, but you'd have to ask yourself the question why? I would say hangovers.
In conclusion, this is worth the five minutes I spent fast forwarding through it and laughing heartily throughout. Fair play guys. You did it and enjoyed it and some people watched it. Destined to be a cult classic. If you can get this thing made, you can do anything! It.