Great idea (and great job actually developing it and not just stopping at the idea). With so many questions about probabilities, this is bound to help a ton of people.
There seems to be some rounding mistakes, at least in the video.
First example:
Two dice,
41% chance first is higher
16% change they are equal
41% chance second is higher
They add to 98% (not necessarily a problem), it seems that you rounded each one down, but for example 1/6 is closer to 17% than 16%, similarly 15/36 is closer to 42% than 41%.
At 7:58 you discuss the probability of getting no 6s with 4 exploding dice.
The program says 47.98%
However, (5/6)^4=0.482, which I believe should be the probability (four dice not rolling 6, no explosion).
Another suggestion, making the y-axis start from 0. I think images such as this
makes it seem like B is several times larger than A, when it is not the case.