Like some other posters said, I think that bit is only trying to get us a bit confused (and the fact that it happens to be Murray's son just some tricky cameo to have us entertained).
We don't know if the guy from the airport was his son, yet all the sequence between them has a really father-son thing going on it. I felt that it didn't really matter if he was his son -though it clearly matters for Don, and for anyone who could be in the same situation-, but they were just two lost people hanging out like if they had this relationship. Look at the way they're dressed. It's the first time we don't see Don wearing a suit and ta-da, the guy, who is dressed the same way, comes in.
Yes, we are left alone to work out our own ending. The guy freaked out and we don't know why (it could be because of the fear of finally knowing his father, or just because he trusted nobody and felt safer running away). But the truth is that Don lives in a really small town and that it felt like if they were a father and a son.
Then, why that shot of the guy in the car? Just to make us realise that Don will have the same doubt that we have. Despite of the nice moment with the little philosopher, anyone could be his son. His son is, once again, lost in a crowd that is plenty of 20-year-old guys, and he's got, as in the beggining of the movie, hardly any clue.
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