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"Rigor Mormist" is a portmanteau of "Rigor mortis" which means "a recognizable sign of death where the muscles stiffen," and "Mist" which means "fog" which indicates the Fog Level.
"Ultimate Battle" was originally intended to be used for Melolune, one of Laura Shigihara's games. The game designer, George Fan, overheard the song and requested it for use in Plants vs. Zombies, given that Shigihara is still allowed the use the song for her own game.
"Graze The Roof" is a portmanteau word of "graze" which means "to put" which probably indicates the fact that Bungee Zombies put down Ambush Zombies in Roof levels, or "to eat," which indicates the fact that zombies eat the plants, and the phrase "raise the roof," which means "to produce noise.“
"Graze" also means to touch or scrape lightly in passing. This may refer to the zombies traversing the roof, and their rather slow movements.
"Grasswalk" is a portmanteau of "grass," which indicates the lawn with which there is grass, and "cakewalk," which means "something that is extremely easy to do," which indicates that the Day levels are the easiest levels in Adventure Mode.
"Loonboon" is a portmanteau word of "loony" which means "a person who behaves in a strange way," which probably indicates the zombies, and "boon" which means "happy and cheerful," which fits the melody of the music.
"Cerebrawl" is a portmanteau word of "cerebral," which means "relating to brain," which indicates that the purpose of the zombies is to eat brains, and "brawl," which means "rough, noisy fight."
Levels 1-10, 2-10, 3-10 and the Mini-gamesAir Raid and Column Like You See 'Em are the only levels to have a music piece called "Ultimate Battle," because Level 4-10 has no music played and 5-10 plays Brainiac Maniac.
There is also an unreleased track called ZomBotany. It was supposed to be played in the mini-games ZomBotany and ZomBotany 2.
There is an infrequent glitch that usually occurs on Pool levels, where the music will randomly change from Watery Graves to Grasswalk.
This also occurs with the Zen Garden on the DS version. It is unknown whether this occurs elsewhere.
"Loonboon" was originally supposed to be twice as fast as it is currently.
The music in Plants vs. Zombies 2 is longer because unlike in the first game, the music is not designed to loop.