The main portion of the film was shot "guerilla-style" at the Oktoberfest 2003, with a minimal crew and a shooting permit that was actually issued for a documentary feature.
Most of the supporting actors, including the Italians and the Americans, were actual Oktoberfest visitors who were approached by the filmmakers on location. The four American friends were actually Australian rugby players who were enthusiastic and patient enough to do all the required scenes (the original script had only three Americans, so the dialogue was split among the four of them).