The theme playing at the very beginning of the pilot is a chanted variation of the prayer "Kyrie Eleison", which is Greek for "Lord have mercy."
Light Yagami and L are often represented as opposites, even to the point that Light uses a PC and L uses an Apple Macintosh.
The Death Note cannot kill a person less than 780 days old, a person over 124 years of age, a person with less than 12 minutes of life left, or a person whose death is set for a date or time that exceeds their original lifespan.
Tsugumi Ôba said L is a mix of Japanese, English, and Russian, as well as either French or Italian.
In addition to being a mix of nationalities, L speaks six languages. Although it can't be shown in manga or anime, but L is fluent in Japanese, Chinese, English, Russian, French, and German.