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Teleport through walls glitch

Obsidian Generator In The End

Sand, gravel, and Dragon Egg duplication still possible in 1.4.3 prerelease

Exploit with spawners and withers

Receiving XP from items placed in furnace slot via hopper

duplicating items

EXP Requirements can be byppassed on anvils.

world not saving/loading properly

arrow duplication glitch

Lead duplication

[Exploit] Can drop through a block/floor using minecart.

Dark oak saplings can break BEDROCK

Plants / Flowers duplicate.

Spammers can crash any Vanilla server with a few keystroke from chat window

Non-OP Adventure players can change spawner types, breaking pre-14w28 maps

Chorus Flower plant, Bamboo, Sugarcane, Cactus and other plants grow instantly when supporting block is replaced with same block type

Exploitable target selector in /tell command

Moving blocks are instantly waterlogged if there is water above

Ruined portal can break bedrock on Certain Seeds

[Exploit] [Save/Load] The player's character is immune to damage for a few seconds after loading the savefile

The player is immune to arrow damage for a few seconds after loading the savefile

The player is immune to potion damage for a few seconds after loading the savefile

You can retain snowballs in Eerie Mojang Office Party event