I Turned the mipmapping to the max and noticed plenty of bugs around the place
First is that around 10 block distance, the blocks seem to be very blurry
that is very close to be honest

Second when placing 1 block in front of you and you start walking backwards you'll notice that the top of the block turns into a flat whitish surface with no texture

Third looking at a block from a side angle gives the same result

Forth While on HD texture packs which have a high resolution 256x, looking at blocks from top or side will make the resolution seem a lot more like 16x16 or less

Fifth the same goes for the breaking animation, It turns to 16x16 or less

Sixth high resolution grass has lines above it which r really weird even though your close to them