I seem to be having a good number of errors. I was running on an older version of Java (some version 7), but after updating the issues persisted.
1) Horses, Donkeys, and Mules a like show as very bizarre accordion figures.
2) By observing the holes in the ground, chunks like to switch around. Screenshotting only shows the single duplication, but the ground is changing very rapidly. There is technically no hindrance to movement itself, just issues with the display.
3) Slimes are invisible. As seen in the photo titled "Glitches" you can see that there are slime particles. They are present and making sounds, just invisible.

Note: This is my first time posting on this forum, so please excuse any formatting errors and informalities.