They talk about how it started with Joe Douglas watching the Houston game and they never were able to watch him in person except for the pro day. That’s why Saleh had Fred Warner give Zach a hug to see how big he really was. Also this section was cool:

In five videoconference calls, one hour each, they showed video clips and grilled him on specific plays from his career. For each play, they wanted to know the call, the protection, his progression, the coverage and the audible (if there was one). He spit back each answer with the speed of a "Jeopardy!" champion.

In an effort to stump him, they didn't show plays in sequential order. They bounced around his career, pulling up plays from his freshman season. They were amazed by his recall. On some plays, he knew the outcome before it started, simply based on down, distance and opponent.