Got a sweater with those little fuzz balls? It's called pilling, and it usually happens to knits of lesser quality. But it can be easily removed with a sweater stone, which pulls the little guys from the threads, leaving a smooth finish.
$18, at The Laundress
Fix a snag or loose thread in a sweater by turning it inside out and using a safety pin to pull the yarn back into the inside of the sweater. Knot and trim excess.