$7E:1470: Carrying something flag. Very similar to $7E:148F, with the difference that, if this flag is set, the player's graphics don't change, and throw blocks can still be picked up as long as $7E:148F remains zero. If used in a carryable custom sprite to check if the player is already carrying something, definitely combine it with $7E:148F to assure there are no exceptions.
#$00 = Carrying nothing; #$01 = carrying something.

7E:148F 1 byte Player Flag used to detect if the player is holding an object (throw block, key, shell, etc.) Also adjusts the player image, different from $7E:1470. This address does store its value to $7E:1470.
If the player is carrying something, this address should usually (not always, regarding the glitch) prevent the player from holding a second item.
#$00 = Carrying nothing; #$01 = carrying something.