During the bucks night, the guys wear tie on penises on their heads. The penises were circumcised. Romans didn't practice circumcision and being a Jewish custom, it would have been offensive to display a circumcised penis.
During the street tour, a shot is of Marcus over his shoulder as he is reading the scroll, the scroll is blank.
When the soldiers rush into the Landlord's home looking for drugs, he greets them with "Salve, gentlemen." However, since there is more than one soldier, he should use the correct Latin plural "Salvete".