If you do it right it will look like a multi-media production. If your overhead has a mistake on it, point it out. There is always someone who notices. And that sort of someone always asks questions. You may be asked a question you don't know how to answer.
Questions tend to come in various standard formats.
The other possibility is to try and play for time. This is a dangerous game but can bear fruit. A second type of question asks you to clarify something. Make sure you can get back to the appropriate overhead quickly. It's always ghastly when the lecturer scrabbles about for a minute in a hopeless search for the elusive acetate.