The room in which the little ogre appears is a reference to the red room in "Twin Peaks" (1990).
Maka's name is an anagram for the word kama which means scyth in Japanese.
Death The Kids name is in reference to the gunfighter "Billy The Kid", and the use of two guns is in reference to where Billy was believed to hide out, Two Guns, Arizona.
There are 3 different repeat openings in soul eater
Most things Death The Kid owns, references something either spiritual or related to death. Examples: his skateboard "Beelzebub" is another name for the devil. His Manor is named "Gallows Manor", which is in reference to the Gallows; the area where people are hung. His Birthday is also October 31st.