When holding any Item/Block in hand, everything in your inv. and hotbar gets mipmapped w/o having mapmapping on.(Mipmap Level:0) However, the blocks around you don't get mipmapped.
These bugs are hard to explain so, it's better to do them your self.
Environment
System.getProperty('os.name') == 'Windows 7'
System.getProperty('os.version') == '6.1'
System.getProperty('os.arch') == 'x86'
System.getProperty('java.version') == '1.7.0_55'
System.getProperty('java.vendor') == 'Oracle Corporation'
System.getProperty('sun.arch.data.model') == '32'
Bug 1: Dupe of MC-56917
Bug 2: Not sure if dupe or not.