Hi! I’m a little late (I just made an account ) and you may (probably) have already figured it out but just incase (or just incase someone else has the same issue) he talks about it in the 5-7min part of the video.
I’ve spoiled out the next parts because it’s mostly what could be found out by watching that part of the video and/or looking at the “Lecture Project Changes” for the video which is the better way to find out.
It’s basically in OnPressedHigher changing “min = guess” to “min = guess + 1” and in OnPressedLower changing “max = guess” to “max = guess - 1”.
This just kind of says "don’t include the guess that was just made in our range. So (for example) if the number we chose is higher than the guess then the lowest guess possible should be that guess plus 1. This disallows any number already guessed to be chosen but in my code and based on some of the topics in some other people’s code can cause it’s own bug if your not careful.