Two more little things - 1. I believe CC's are only accepted for purchases of $20 or more (but I may be wrong).
2. Throughout the system boards will tell you when to expect the next train (in minutes until arrival). When at Gallery Place, you'll see that the board will only be showing green line trains, and no yellow line trains twd Huntington. This is due to the yellow line commencing just one stop further up - so they can't tell you when the next train is coming as it hasn't left the terminus. Only 3 mins or so before it comes will they start telling you about it on the boards... your train will be coming soon after the opposite yellow line train shows up.