Only a signal strength of 15 can override comparator output

Trapdoors can stay on the wrong side of slabs

Not retracting pistons

Command Blocks seem to be affected by the order in which redstone is updated

A Comparator can lock a Repeater, but the Repeater doesn't look like it is locked

Hopper can't pick up items which sit on top of the stand of a brewing stand

Inventory checking output overrides stronger redstone signals

Comparator can pass through signals greater then 15

Duplicating/deleting blocks

Point of view gets reset while riding a minecraft which glitches through a block