During the opening credits, we hear alien lyrics being sung: "E take nas naj...nah sus gah nilpa." This is actually the names of produces Kenneth Johnson's wife and daughter (Katie Johnson and Susan Appling Johnson) sung backwards. In fact, most of the alien language was, in fact, backwards English, which helped to keep gramatical rules intact. Other inspiration for the language came from Russian, as well as nonsensical and made-up words.
Growing pains during the Fox Network's first year resulted in a cash crunch that forced the cancellation of this series after its first season, despite a season-ending cliffhanger. The never-produced second season opener was adapted as a novel and a comic book, and the series itself was later revived as a series of TV movies beginning with Alien Nation: Dark Horizon (1994).
Contrary to how the "Albert Einstein" character (played by Jeffrey Marcus) is continuously referred to during the series and later movies (as dim-witted/slow), he is actually full of very insightful, compassionate, curious and clever/witty moments throughout his time on screen.