Add info on beds, slabs, redstone repeaters, flower pots, etc., and changes in player movement/height due to these "transparent" block types.
Beds, slabs, redstone repeaters, enchantment tables, flower pots, etc. all have non-standard block heights that allows the player to automatically move onto them without jumping (with the exception of the flower pot and the bed), or causes the player to have to jump in order to move forward if the blocks are used in conjunction with regular-sized blocks. This is apparent with soul sand, as it can be used in front of a 1 x 2 block doorway to create a one-way entrance. This is due to the fact that soul sand is slightly less than 1 block in height. Any transparent blocks allow beacon beams to pass through.
When placing a block in any version of Minecraft with a slow, laggy computer, two blocks may be placed when only clicking once, and when attempting to remove one block, two blocks may be removed. This also happens with doors. People with particularly low-end hardware may even experience three blocks being placed or removed with one click of the mouse. A good way of combating this problem is by reducing the render distance or by using mods like optifine to change the game settings and speed up the game.