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If Mold Remediation was performed properly there are a few things you should be able to see, even with an untrained eye. 

1. On a basic and an expected disclosure basis, the owner should be able to explain what the mold problem was, including the extent and cause.
2. The area remediated should look clean or cleaner than it was before the remediation. While clean is tough to quantify, you would not expect a crawl space or a basement to have a sense of clean like a living room, generally it should be devoid of debris and heavy/dust/dirt.
3. No mold should be visible. This is important, as the site of mold may have been the trigger for remediation.  Remember remediation = removal.
4. The space should be dry. Simply put, moisture caused the mold growth, just remediating the mold without addressing the cause does not solve your problem. There  should be a working dehumidifier in basements and crawl spaces. Building repairs that allowed the initial water entry should be completed, such as leaking basement windows, or roof leaks.  On the outside -  roof leaders should be extended away from the house.   There should be a slope away from the foundation to carry water away (positive drainage). 
5. Ceilings, wood framing, roof sheeting, any remaining organic surfaces within the space, should have been treated with a mold resistant coating.  The coating seals the wood to prevent moisture from getting a toehold, which is exactly how the mold was able to grow  in the first place.  The coating should also have a long acting fungicide to prevent future growth.  The better coatings have a 10 year warranty and are white in color so you know the area has been treated visually.  The clear coat products have lost favor, as it is difficult to ensure that application was even and thorough throughout the space.
6. If the owner performed the remediation, an invoice should be obtained to ensure that the mold remediation was performed professionally and not DIY. 
7. A warranty (typically on the mold resistant coating) should be obtainable and transferable to the new owner.  Warranties that are provided by the company PERFORMING the work are nearly worthless since these companies come and go with little in financial backing.  The companies that manufacture and sell the coating to mold remediators to utilize are multimillion dollar firms with the deep pockets to backup and support any future warranty claims.Click to edit your new post...