An incidental remark to a person next to one made discreetly but not in private, audible only to that person.
A minor related mention, an afterthought.
A brief comment by a character addressing the audience, unheard by other characters.
aside from
Not in perfect symmetry; distorted laterally, especially of the human body.
To or on one side so as to be out of the way.
Incoherent or wandering speech and thought.
Straying off from a course or way.