| "or" typically is used to link multiple items where only one can be chosen. However, the exclusive nature of this usage is somewhat vague. It is also acceptable for it to conjoin multiple choices where more than one can be true.
Putting "either" in front of the list makes it a correlative conjunction (and an exclusive disjunction), and ensures the exclusivity of the choice: only one selection can be made.
However, regardless of whether the intent was inclusive or exclusive, THAT'S NOT THE ERROR! Pay attention here:
He left off the predicate nominative/adjective!
Focus on the above sentence and meditate. Eventually you will understand and be enlightened. ;-)
Hey, so I'm redundant. Bite me. Better yet, bite Spisefisken - he might like it, but I'm sure I wouldn't. | 
