On Dr. Fetus at 45m, Edmund is quoted on a previous GDQ that the finishing plane was extended there because he got tired of playtesting the game so many times, so it put it there so he'd have to playtest each run a few seconds less.
Phenomenal run! Also I love GDQ for studying. It's post midterms and having this on in the background helps me keeping going on my work, as well as being a nice treat for me to tune back in to if I ever need a break!
Regarding Flywrench the publicly playable prototype had premiered back in 2007 and how the character plays in Super Meat Boy is still nothing like that version either.