Very good thread and thanks for the use of the lurking privileges. More cat-skinning on carb heat: a few posts up a contributor referred to opening the throttle on go around and then setting carb heat to cold. I have heard some instructors suggest that this could produce a rich cut (too much fuel, not enough air, glug glug, putter putter, stop stop).
I usually remember to shove the heat to cold before applying full power in any situation, and was always told to get rid of the heat at 300 agl on final, principally to facilitate the go around if needed and secondarily to stop the engine getting clagged up by unfiltered air as you pile onto the field in a flurry of dust, feathers and wet grass.
On clean ups on the roll: at least one instructor I have flown with insisted I do them when clear of the runway, but whenever he landed the beast he always did them on the roll. This may have been a judgment as to student capacity thing. I must confess that I have taken to cleaning up on the runway these days (If he's reading these he'll come round and tw*t me). Are there not good aerodynamic reasons for raising flaps as soon as the aircraft is safely down (OK it helps if the idiot designer hasn't stuck a gear handle or switch right next to the flap handle or switch), but all the rest (fuel pump, transponder, VOR etc) could wait for later and may be better done from checklist simply because they are fiddly and easy to forget.