  In this Comment we show that Cabello's proof of Bell's theorem without
inequalities [Phys. Rev. Lett. 91, 230403 (2003)] does not exhibit two of the
three "remarkable properties" which the proof is claimed to possess. More
precisely it is our purpose to show that property (c) of Cabello's proof,
stating that ``local observables can be measured by means of tests on
individual qubits" is definitely false since it has been obtained by a wrong
use of the basic rules of the quantum formalism, while property (b), stating
that ``distant local setups do not need to be aligned since the require perfect
correlations are achieved for any local rotation of the setups", is also wrong
due to the failure of validity of property (c).
