Is there any science behind movie/commercial camera angle changes?
Admittedly, this question has intrigued me also.  This is a partial answer, as the article below deals with perceptions borne of camera angles of a person, as an example of the effect of camera angles.

According to the article "The influence of camera angle on comprehension and retention of pictorial events" (Kraft, 1987), camera angles significantly influence viewers' mental construct of the story representations.  These representations are related to our experience with the real world around us.

Kraft summarises previous research in saying that there is a connotation that:


  physically looking down at an actor
  translates into looking down on that actor; physically looking
  up at an actor translates into looking up to that actor.


This also could apply to characters.  Thus influencing our perception of the person and the events surrounding them.

In regards to scenes:


  by changing vertical camera angle, one changes the real life
  consequences of the pictured scene.


These connotations are often 'woven into the storyline'.

I hope this helps