Dr. Lamb says, "General, a machine becomes human when you can't tell the difference anymore." This summarizes the famous Turing Test, devised by Alan Turing, a founder of modern computer theory.
D.A.R.Y.L. stands for Data Analysing Robot Youth Lifeform, as shown on a screen in Dr Stewart's laboratory at 50:49, where the British spelling of the verb analyze is used.
In response to whether acting is work or fun, Barret Oliver states in a 1985 "Star Log" interview: "I think it's fun, but it really is a job. In D.A.R.Y.L. there was a part where I had to freeze to death and they didn't even use it. It can get kind of frustrating.