My experience...
if you press the "Y" key, sometimes disappear all the characters and vehicles
lagging and slow video sequences
carl jumps sometimes while running
you have to double click the "home" button to pause the game and to reach the options.
you need the touch pad in the map view and social club login screen
free aim is very hard: press "O" and "A" together and aim with the left stick at the same time


PS: sry 4 bad english