Observatory crest song

  • It looks incorrect, is it intentional? What does it look like for a native speaker?
    It is song lyrics, so it is poetry. It is lines in a song, not "sentences" with grammar rules.

    There are no rules. It cannot be "incorrect".

    We'd just saw a concert and heard all the best
    Thought we'd saw flying saucers and all of the rest
    The bold syllables are stressed syllables, and "best" rhymes with "rest".
    Those things matter in song lyrics (poetry). They don't matter in sentences (prose).