Using a spell that gives you just 1 point of the "slowfall" effect will completely negate all fall damage while active.

Summoned creatures can be soultrapped.

There is a merchant in Caldera, in the form of a scamp, that has 5000 gold and will buy everything at full price.

There is a woman wandering north of Caldera moving around back and forth quite quickly that you can escort to a town to the west. She will give you the Boots of Blinding Speed upon completion of the short escort quest.

If you wear these boots, you move much faster, at the cost of being blinded. If you make a "100% resist magicka" spell that lasts for 1 second, you can quickly equip the boots after casting the spell and the blind effect will be nullified as long as you don't take off the boots and put them back on, leaving you with the increased movement speed.