When Sam accuses the Catholic priest of having violated the eighth commandment by lying, and priest corrects him, "ninth". That is the number used in most Protestant denominations, but in the Roman Catholic enumeration "Thou shalt not bear false witness against thy neighbor" is indeed the EIGHTH commandment.
When the cops are "on the air" with Brother Love Butter, the VU meters on her/his control board do not move . . . which would not be the case if it were a real radio/audio setup.
Paintball shells were not in production in 1973 (and in any case cannot be fired from a police revolver).