Just thought I ought to note this.
1. All things you by when an interior designer have 40% chopped off of them. The value is RESTORED when you get back on.
(This may require a change of the dynasty rules, no?)
2. Your mood keeps on getting higher, and higher, and higher... When you are playing a sim, the moodlets do not seem to detract properly, and your mood can be elated with no moodlets at all. No mean spirited. (Note, this might be caused by over emotional, but I have not tested)
3. When you make a sale in the consignment store with the suave seller REWARD, it tells you the sale was greater due to the suave seller TRAIT.
EDIT:
4. With interior designer, all the relationships of the your clients will keep on going up at a constant rate, AFTER you have done the jobs. However, this effect quits when you quit the game (The relationships stay).