I might have reached max lives, kept picking things up and did not die. Coins is just fun to collect, even if you never get to use them, just raise the bar a ridiculous amount.
Might have missed that particular conversation about Booker and Stella, which reminds me, some of the map conversations that continue should maybe be possible to be forwarded by pressing interact, you have to wait for them now if I have understood things correctly.
Yes, treasure chamber was the slot machine room.
Forgot to mention that the photobooth was really cute btw.
Hope your appointment goes well!