A common phrase in baseball, elephant ears are simply when the pockets of a player's pants are seen outside of their slits (which happens often to back pockets which are in no way attached to the inside of the pants). Phrase made most popular by Duane Kuiper and Mike Krukow, San Francisco Giants TV broadcasters.
A door wall is a sliding-glass door or patio door. The term is yet another example of banal Michigan vernacular, where in the residents latch on to company names, trademark names, marketing terms and product names from local companies. The terms become embedded in the local vocabulary and eventually become accepted as actual valid words and phrases. In this case the term comes from Wallside Windows in Taylor, MI (a large window manufacturer), where 'door wall' is their created word for sliding-glass door.
"Bob! John's gonna bring over them doorwalls from Wallsides on Tuesdee afternoon 'round two-thirty. Get 'er done!"