When I first did a walk around on a Devon I asked about the asymmetric elevators. The story I was told was that they trimmed a bit off one when doing flight trials, to correct an over-balance problem, found it worked, so just left it like that in production.
Diverted to HMS Gannet in a Devon, strict instructions given to NOT chock the nose wheel, but to chock the mains (castoring nose wheel and virtually non existent parking brake). Car took us home. Woken at ~05:00 by the line chief at Gannet on the 'phone, saying he'd "lost" our aeroplane. Drove hell for leather up to Gannet to discover they had found it, parked on the grass. The plonkers had only chocked the nose wheel and the wind had castored that around during the night, then taxied the aeroplane between two rows of parked Seakings, before it rolled on to the grass and hid behind a hangar. How it never hit one of the parked cabs is a complete mystery.