QJ - on the 737, yes, it can 'surprise' in roll. Unlikely in pitch for the reasons stated above for the 757 (as long as it remains within the a/p trim capability) but any aileron input applied by the a/p 'disappears' completely at disconnect as it is not 'trimmed' and significant roll divergence can occur. Another cause would be 'un-noticed' lateral fuel imbalance which severely caught a colleague of mine a while back.
Again no rudder input (on current 737 a/c) although I believe it may now be available as a 'customer extra'.