Resist the instinct to pat a child on the head affectionately; it’s genuinely off-limits, however friendly the intent. Adults touching each other’s heads is off-limits too, outside specific contexts like a haircut.
When sitting, keep your feet flat or tucked under rather than propped up or pointed at another person, a Buddha statue, or an image of the King. Never step over someone lying or sitting on the floor, their outstretched legs included, walk around them instead, even if it takes a few extra seconds in a crowded room.