We had a chap caught out by the governor panel being positioned slightly different in the 212 and 412 centre console, one higher than the other. We operated both types, meant to grab the hydraulic and got the governor instead with predictable results. Not the first time some one has been caught out by aircraft having disparate set ups.
One interesting 212 failure by one operator was the practice of placing ones pencil on the centre console, chap lowered collective and an engine immediately went into manual. Pencil had vibrated out to be caught under the collective when it was lowered, edge of panel acted as a fulcrum, other end of pencil caught under the switch and lifted it out into manual.