The first one seems more like an interruption more than anything, it’s a fun idea and it’s thematic but it just seems a bit intrusive? I do think there’s nothing wrong with the other ones though.
I see what you mean, it would be a small blue box in the bottom right that would affect your gameplay - you would click y or something and it would bring you a drink, otherwise, go away in 10-15 seconds (as shown by a white bar that’s moving across the box)
Casino themed shop would be neat. Besides obvious items it could include, I imagine some silly items such as an oversized stack of casino chips or oversized dice as a furniture item on which you can sit.
EDIT: Solitaire and Mahjong machines would be neat additions to the Casino.