The song "eBaum's World dot Com" is essentially one long Take That! at Eric Bauman, who the Internet is not exactly fond of.
"Reaganomics" is a Take That! at the 80's economic concept of the same name, the effects of which are largely understood to have contributed to the financial crisis of the late 00's.
Fanon: A popular interpretation of Touch-Tone Telephone (especially in fanmade music videos or animation memes) is that the main character also had a crush on the radio host they kept trying to contact.
Growing the Beard: Spirit Phone was a large step forward in songwriting and scope compared to Lemon Demon's more novelty-driven early output. In turn, it was the band's first LP to be positively noticed by music fans and professional critics as a full album, breaking it from its "meme two-hit wonder" status into legitimately respected synthpop project.
Memetic Mutation: "The Ultimate Showdown of Ultimate Destiny" is probably the most well-known Lemon Demon song due to the popular flash animation based upon it, and "BRODYQUEST" also gained notoriety to the point of receiving multiple remixes and being noticed by the actual Adrien Brody. Two Trucks has also somewhat reached this status.
Tear Jerker: Depending on how much you relate, SAD, a song about Seasonal Affective Disorder, can be this.
What Do You Mean, It's Not for Kids?: Lemon Demon does have mild cursing and violence in his other works, but is usually pretty family-friendly. But it is surprising when the "Nature Tapes" EP only has 2 non-explicit songs.