After watching the movie multiple times, something struck me. When Grace finally admits he’s not going back to Earth and will die in space, Rocky says “Why didn’t you tell me?” Not “Why you not tell me, question?—as you would expect him to say and is the grammatical structure he uses just before and after this. At first I thought that maybe the phrase was recorded at a later date and the actor forgot how to make Rocky sound like Rocky. But then it made me wonder if it’s intentional. Since there are other references to movies throughout this one, is it a nod to Luke Skywalker’s question at the end of The Empire Strikes Back: “Ben, why didn’t you tell me?” Honestly, I have to go with this explanation otherwise it’s quite a glaring inconsistency.