The license plate number for Hiro's father's limo (played by George Takei) is NCC-1701, the number for the USS Enterprise from Star Trek (1966) on which Takei played Mr. Sulu.
Claire says that she and Zach need to see a manatee at an aquarium in Lubbock. While the city has a fairy large population, it is in the middle of nowhere, which makes it a terrible location for drawing tourists, plus it is in a semi-arid location with a tremendous amount of dust in the air. The placement of a fictional major marine life park is a joke on the part of the writers.
Bennet has an A Restriction on his Driver's License. In Texas, a driver's license with an A Restriction denotes that the driver needs corrective lenses to drive.
Final episode to feature Zach.