This is the first episode in the series to have Clark change into Superman in a telephone booth.
This is the first episode in which Clark spins into his Superman suit.
This is the first episode in which Jonathan and Martha have any interaction with Jimmy.
Although the antagonists of this episode are original characters, there have been several other characters named Doctor Light in the comics. The most notable are the supervillain, Dr. Arthur Light and the superhero, Dr. Kimiyo Hoshi, who both use light-based powers.