Interestingly, you will find that opening the left side door will cause the aircraft to very gently roll to the right. This may seem counter intuitive - anyone want to venture a guess as to why? I have my unverified opinion as to why...
The open door blanks flow on its side of the vertical fin, giving a yaw input that can couple to roll. Left door open thereby generates a turn to the right, similar to a right rudder input.
On a certain other type of aircraft that looks like Cessna copied its design in 1945
you can control the aircraft with the doors, throttle and elevator trim.