For the hand cursor I had the same "bug". It's code/logical bug though.
When your cursor is over the Play button, it is also not over the CutScenes and Credits button, so as the events are read from top to bottom, the test for the CutScenes button works as the only "not over" condition is false.
The solution is to save 2 events and have a single common "Not over" condition testing if the mouse isn't over the three buttons. If it is not, then the cursor is to be "normal".
For the bug B, your layout WorldSelect is linked to the event sheet CutScenes.
CutScenes includes WorldDisplay which include back.
But in all this, the click condition is set in "WorldSelect" event sheet, which is not included.
Include it in CutScenes for example, and here your screen takes you to MC-1.
You have a nice interface/GUI, very sober and well thought.