The Translator chip (error)
Now, I will stand corrected if wrong here, but this is my take on this.
Firstly, I must say that I have always loved this movie, granted being born in 1978 it was a film that I grew up on. Having just watched it again today, at the tender age of 32, picked up on what I believe to be an error. Something I would never have picked up in my younger years.
When Alex is give the translator chip (albeit a digital watch circuit board), I am to believe that this allows him to understand all other alien languages in plain english? Fair enough...
What am I to believe when Alex returns to Earth and introduces his Family and Friends to Grig? In order for them to understand Grig, they would all have to have a translator chip under their collar to understand him??!!??
Somewhat convenient...