Data asks Dr. Crusher what is the definition of life and she struggles with an answer, yet in the episode "Home Soil" she had no problem defining it and actually analyzed the definition, with Data's help. She may not remember it but Data?
Troi: Why is it so difficult to accept the fact that the exocomps could be alive? After all, you're talking to a living machine right now.
Dr. Farallon: And I have nothing but the utmost respect for Dr. Soong's accomplishment, but his intention was to create an artificial life form. I created the exocomps to be tools. And there's a big difference between Data and a tool.
Data: Doctor, there is a big difference between you and a virus, but both are alive.
Data: It is true I am acting out on my personal beliefs. But I do not see how I can do otherwise.
Levar Burton was allowed to regrow his beard for this episode as he needed it for his wedding.