Dinosaurs are NOT lizards at all, let alone giant lizards. Yes, They both lay eggs. Yes they are both types of reptile. However, they are not synonymous. Here is an image showing the key difference between the two. Lizards have legs that are 'Sprawling' whereas dinosaurs stand erect. If you're interested in reading more about what actually makes a dinosaur a dinosaur you can read the well-sourced wikipedia article here.
The other idea of his that ties into this whole shenanigan is that they lived in the garden of Eden 6000 years ago. I've already written about this before so if you've read that post you should know how absolutely ridiculous this notion is. Something that I haven't mentioned before is the reason he gives for why the "lizards" grew so large and why people lived for so long. He believes that there was a water canopy in the sky that filtered harmful radiation from the sun out, allowing people to live for 900 years and causing lizards to grow excessively large. Not only is this idea completely unscientific but his reason for having this belief is laughable. The genesis account mentions a firmament in the sky. From this one mention of a firmament he derives this belief that he goes around deceiving children with.
A bit of a disorganised post but hopefully there was something worth reading in there.