One of the drags of being educated in television & film production is that you notice stuff that the average person misses out on.  Case in point, a new Febreze commercial that's running in our area right now. 

If you catch the commercial on your television (the YouTube is a little compressed, so it's harder to hear), it's pretty obvious that the boy's dialogue was "looped", which means that they went back in post-production and re-recorded it.  You can tell because the tonal quality of the audio is way off compared to all the other dialogue, and because the dialogue does not naturally line up with the boy's lips as he talks.  Usually looping occurs because there was a sound problem on the shoot--say a crackle kept appearing on the tape, or because it would be very difficult to capture decent sound--say you are filming a series of loud explosions with the actors in the foreground.  But in this case, every other performer's voice is from the shoot, which leads me to believe that the producers didn't like the young man's performance for some reason.  Perhaps his voice sounded "too young" to be having girls come over or perhaps he had a very slight lisp that the producers didn't like.  Who knows?  But every time the commercial comes on, I find myself becoming fixated on the fact that his voice was rerecorded and just does not line up with any of the other performers.

BTW, I should mention that one of the things I liked least about being in television production was when young performers had to be judged critically.  While I understand that they have willingly chosen to get involved in a very difficult industry where you are continually judged (and generally continually found wanting), it was always so horrible when we had to let a young performer know that their voice had matured too much for a role or that we needed someone who sounded a little different for the character.  It really is almost never a personal decision--the producers generally LIKE the kids they've hired, or else they wouldn't have hired them in a first place.  But even so, it always sucked.