This is the first episode of the revived series to use the convention of the classic Doctor Who series of naming Dalek-centered serials as "(blank) of the Daleks" (The Power of the Daleks: Episode One (1966), Remembrance of the Daleks: Part One (1988), etc.). This convention would later be used for series 5's Victory of the Daleks (2010).
This is the first two part story in the revived series to not feature the inside of the TARDIS.
A deleted scene involved the return of the Doctor, Martha and Frank to the Hooverville with Tallulah in tow, and saw the Doctor admit to Tallulah that he'd be unable to reverse Laszlo's transformation. It was cut because it had been shot too late in the day, and so the light was insufficient.
Shortly before the lightning strike the group on the top floor waiting for the elevator speak about staying away from any metal to avoid being shocked all the while they're leaning again a giant steel I-beam support.
This episode takes place on November 1, 1930.