From running through the common events, it appears that switches 204 to 207, as well as variables 218 to 232, all need to be reserved for all three of these "mini-games" to work,  which are more than what was described on the store page.  Probably due to the addition of the slot machine.

Let me know if the above is incorrect.

Apologies, you are correct! It seems that I forgot to update the reserved items on the store page, sorry. 

I've updated it now, thank you for flagging that! :D