This picture shows a concrete pier and a CMU wall joint.  The joint is already cracked and open below the flashing line because the two lowest CMU courses have been erected earlier and already shrunk. The elastic, compressed filler [for example a neoprene sponge tape] shall be installed in this control joint instead of mortar. Two pieces of flashing visible on the photo shall be carefully cleaned and lapped at least four inches.  On a construction site is very difficult to achieve a proper adhesion and tightness.  The upper edge of the left piece of flashing shall be secured to the concrete pier by a terminating bar. The agreeable example is the dovetail slot embedded into the concrete surface during forming.  (There is a visible foam strip partially pulled out of slot.)
Unfortunately in many cases the slot is forgotten during concrete forming process and as a result the masonry ties are produced in random fashion. Most building codes call for staggered ties in following courses, which can be seldom achieved when dovetail slots are in place.

Below is an example of a poor flashing installation: the fabric is warped, folded and incompletely adhered. The lower edge is installed tooshort (see the yellow chalk arrow), so the lower course of brick and concrete would be saturated by water, then freeze-thaw cycle would cause spalling.