I asked the roofing company at that time if there was anything more I need to do, since the area inside the roof must have got wet due to the rains, and they told me not to worry and to paint the discoloration on the drywall that happened due to the water, after the drywall dries up.

Just few discoloration spots.

The owner fixed the discoloration in a closet she called "black mold", but it was never tested or confirmed to be even be mold.

During the inspection process of our 2 bed 2 bath condo in Inglewood, we noticed some discoloration and moisture marks in the top corner of the master bedroom closet.

I'm not at all a fan of cultured marble countertops because random soaps and products can discolor and damage them, and the 80s swirl is so out, but I've had good luck with shower surrounds and tubs.

To avoid plumbing and water damage, check for spots on the walls and floors that look discolored or warped and feel to see if they’re soft or mushy.

Offer your landlord $200 and if he doesn't like that then let him take you to court, or if he withholds your security deposit then take your landlord to small claims court.There is a normal amount of wear, dents, chips and discoloration that is an expectation with countertops.

To answer your question specifically, look for loose or curling shingles, discoloration, particles stripping from the shingles and falling in the gutters (they look like tiny pebbles), streaking, or roof leaks inside (a very late sign). 

Master Bath - same Formica counters with oak cabinets. old stand up shower with discoloration and doors that work, but not great. 

Like @Theresa Harris mentions - I've seen clear or white seals get discolored from whatever, that isn't mold.