Yes. It's a minor note played over a major chord, implying an F#7 chord. The song also happens to change keys from C minor to B minor during this phrase. Without getting too deep into the music theory stuff, F#7 is typically the chord that creates tension in this key and wants to resolve to B minor (the "home" chord). Of course that resolution does happen after stretching out the tension all the way into the chorus, which makes the chorus itself all that more satisfying. Amazing songwriting. There are a ton more details in that passage alone that make the song great, but I digress. "Worst Maiden song of the century" is a far more interesting topic anyway.