It crash because this spawn egg is nof of a mob.
This is not 1.8, if it were the 1.8 the enchantment table must have a slot for lapis
This is a launcher error, not a minecarft issue.
This is a Launcher issue not a Minecraft issue
Try a resource pack with minor resolution
This is not a Bug
Be affected by commant block is not the same that affect the command block
This rabbit is a normal rabbit, is neutral
Even is intended, the /summon command migth spawn one rabbir per time.
Dupped from https://bugs.mojang.com/browse/MC-60222
Sure is a hostile Mob?
The hoppers empty two per two, but if you lock the bottom hopper with a redstone pulse it empty one per one. In conclusion the hopper empty one per one more than it had to.
Try to use the default texterures, maybe is cause for your resource pack.