What might you need to do if an assignment mistake is encountered?

The most appropriate action when encountering an assignment mistake is to contact the Assignment Recordation Branch. This branch of the USPTO is responsible for managing and correcting assignments of trademarks, ensuring that ownership records are accurately maintained. If there is an error in the assignment documents or if an assignment was not recorded properly, contacting this branch allows for guidance and the necessary steps to rectify the situation.

The other choices do not address the issue directly. Displaying the trademark on products does not resolve an assignment mistake and could complicate ownership issues. Filing for trademark renewal is unrelated to corrections in assignment records; renewal pertains to maintaining the validity of a trademark rather than its ownership. Changing the trademark name does not correct an assignment mistake and could lead to further complications in ownership and brand identity. Therefore, contacting the Assignment Recordation Branch is the correct and most efficient approach to resolving any assignment mistakes.