When the boys are being led away from the protest, a centurion covers Grumio's genitals with the centurion's helmet. In 1974 (AD) during a rugby union game, a policeman covered a streaker's genitals with his police helmet.
Despite the episode taking place in 26 B.C. the protesters are seen to be using tomatoes as missiles. However, the tomato would not arrive in Italy until the middle of the 16th century A.D.