It's one specific image that keeps being repeated and replaced with the icon for "broken image" and the word "pc" next to it. I've seen it in his questline.
If you’re playing the online version, I recommend downloading the game, as the online version on this page is a very old preview.
If you’re playing the downloaded version, could you be more specific about where the issue is happening? Is it when you’re in his garage, when you click to talk with him, or during a quest like visiting the university?