In his review he says that he accidentally has pressed the software buttons while playing games. I don't know about Jelly Bean but on my TF101 ICS there's an explicit option to enable locking/unlocking of the soft buttons if you check the advanced page on the system settings. Once that's enabled, a small "slide to lock" padlock is constantly visibly in the middle of the status bar screen. So the next time when you want to play or something, just slide to lock the soft-buttons.
