It’s very likely that Marty doesn’t fully grasp some of the concepts he’s reading about. He’s certainly not repeating them back correctly.
In panel 4 I wanted it to look like Bob was pinching the bridge of his “nose” but it mostly looks like he’s face palming. That works too, really.
Again, the poster in the background was not made by me, but rather is used by permission of Mr. Freeny of Moist Productions.