In my opinion, this definitely
IS a glitch. (Or VERY sloppy programming).
It is true that to a certain extent the spinning reels are just "eye candy", and in most cases the final reel position is "cut in" just before they stop spinning.
This can frequently be observed if you play a lot, as symbols which do not lie next too each other on the reel strips can appear to be adjacent just before the reels stop spinning. e.g. you might see TWO wilds or TWO scatters next to each other.
With MG, the cut-in sometimes includes 2 or 3 extra symbols which "run off" the bottom of the screen, but with NetEnt they don't do this, and it's only the final 3 symbols which are cut-in.
But in the video above, the Nitro definitely appears to be in these "final 3 symbols" as you can actually see it stop. = Glitch.
Having said all that, I get the impression that recently NetEnt have been using different developers for some of their games, so it could be a slightly different "engine".
The way to tell for sure (which I haven't done yet) is look carefully at reel 3 (when stopped) and see if there is a Nitro symbol on the reel strip between the 2 characters (Twitch & Hamaki) which end up above & below it in the video.
{Edit} OK - been and watched about 8 videos of free-spins now, and observed the Nitro landing on reel 3 about 15 - 18 times:
It appeared in 3 different places on the reel-strip, with a
J,
Q, and
A above it, and a Car below in all three cases.
The only time I saw Twitch & Hamaki, there was a
10 between them (see screenshot).
Conclusion: VERY sloppy programming.
KK