The Customs and Immigration would not allow the visitors to enter the United States without the proof of return flights. The East Germans had only enough money together for two one-way flight to New York City as indicated at the travel agency in Berlin. Additionally, the agents would demand the financial proof that the visitors had adequate amount of money for travelling within the US before admitting them in.
The East Germans brought the small film projector with them to the United States. The projector would spin at half speed and the bulb at half illumination due to difference of voltage between East Germany (220 V at 50 Hz) and United States (110 V at 60 Hz). That is unless they brought the voltage converter along.
Trabant 601 S, the East German car driven across the Golden Gate Bridge, had SU sticker which was an international code for Soviet Union and three different vehicle registration numberplates: the correct East German one in the front along with archaic 1967 British numberplate (as denoted by "E"-suffix) and period-correct California numberplate. The vehicles registered in California are required to display California numberplates in front and rear to be legal; this Trabant didn't.