If you have already named a beneficiary for your property, you cannot give that property away in a Will. There are several types of property for which you may have already named a beneficiary, including some types of bank accounts, stocks and bonds, insurance policies, retirement plans, pension plans, etc. If you have already named a beneficiary for one of these types of property, you should not include it as a gift in your Will. If you want to change the beneficiary, you should do so directly with the institution with which you have the account.
Some states entitle your spouse or registered partner to claim a right to live in your home until he or she dies, even if you give the home to another individual in your Will.
Property owned as joint tenant automatically goes to the surviving owner when the other co-owner dies. An attempt to give this type of property away in your Will would likely fail. Also if you live in community property state, you can generally only give away your half of the community property.
If you leave property through a living trust to someone, you cannot give it away to another person in your Will. With the Bloomwell living trust, this is not a problem because it contains a pour-over Will, such that the two documents work together to pass on your assets in a coordinated manner.
If you have assets in another country, you should consult a lawyer in order to create an 'international will'.
There may be other types of property that could be difficult to give away in your Will. If you are concerned about this, you should consult with an attorney.