Rockstar has announced that installing the GTA V "play" disc will cause texture pop in and other graphical issues. Both the Xbox 360 and PlayStation 3 versions are affected. The game comes with two discs, one is a mandatory install, and the other, play disc, is optional.

@justinkeppler @Insanely_Bored @EliDrinksZona An 8GB install is required. For optimal performance, we recommend not installing the play disc

— Rockstar Support (@RockstarSupport) September 16, 2013

Example video of why you shouldn't install the "play disc" on the Xbox 360: 

• On the Xbox 360, for the best possible performance, loading speed (Improvements include a faster loading map) and in general to decrease the load on the laser disk drive, it is recommended to install the second GTA V "play disc" to a USB drive. You need a 16G drive or bigger.