Yaw and Pitch
Most single engine propellor aircraft will pitch following yaw, owing to the a 'gyroscopic effect' applied to the rotating propellor. Particularly easy to show in a Cessna but to varying degrees in other types.
The gyroscopic effect leads to (clockwise engines);
A) Yaw to the right - Roll right - Pitch Up
B) Yaw to the left - Roll left - Pitch down.
With anti-clockwise engines pitch up/down reverses. A simple experiment to demonstrate this is to use a bicycle wheel. Somehow hold onto the axle and spin the wheel clockwise - observe and feel the very powerful change in pitch. Repeat anti-clockwise.
I wouldn't want to argue as to whether there are any further aerodynamic effects acting on the airframe that causes pitch change in the case of a PA38..