Why do I see extra elements in my message template while previewing?
Oracle Service Cloud, all versions
There is two types of templates that is used for generating the email body. First type is a Message Template and it is specific to the message you're sending as it can be a email that is send by rule or is a final response before incident closing. Those messages can be customized for each specific case you may have as well those are specific for each interface.
Second type is a Global Template which is a main template that wrap or frames each message template and is mostly used to brand your outgoing mail.
While editing Message Templates some extra elements will be displayed during preview or when actual message sent. Example can be Company Logo or URL links. Those elements is a part of a Global Template.
For additional information, refer to the Edit a Message or Edit the Global Template sections for the version your site is currently on. To access Oracle Service Cloud manuals and documentation online, refer to the Documentation for Oracle Service Cloud Products.