Aluminium Christmas Trees: Tattooing was actually illegal in New York City at the time, the practice having been banned in 1961 note it's not completely clear why, but some sources state the health risks of tattooing at the time, especially with a hepatitis outbreak in the very recent past and the 1964 World's Fair just around the corner making city officials afraid of the city being seen as a haven for disease. . The ban would not be lifted until 1997, though as the episode implies, it was widely flouted in the city with underground tattoo parlors flourishing under the radar.
