None of these should affect actual play as all are purely visual effects.

The visual direction of water and lava flow has been reversed so that it will appear to flow into source blocks.

Melon blocks and melon & melon slice items have been turned 'inside-out' e.g, rind inside, flesh to the outside

Mushroom blocks (red & brown), as well as mushroom stem blocks will show an animation cribbed from the end portal rather than the standard insides.