Technically speaking those are "falsetto" tones and not a "head voice".
Falsetto (from the Italian word for "false") describes the mechanism that occurs when the vocal folds temporarily "blow open" which produces a flute-like tone (as in the links you've mentioned).
This is different from "head voice"; which is a Falsetto that has been modified by the shape of the mouth to create more downward pressure on the air as it flows out, which in the end causes the note to resonate more like a chest tone.
"Just a small-town girl" (and most of the song's lyrics) are sung in classic "head voice".
Journey - Don't Stop Believing
Here's a YouTube video by Robert Lunte who sings a Falsetto tone immediately followed by a head tone (which he also calls "twang mode").
Falsetto is NOT Your Head Voice!