one point of interest and possible source of confusion is this...all PAPI's/VASI at newark airport are on the pilot's left while approaching the runway, EXCEPT for runway 29...that runway has the PAPI on the RIGHT.
which would mean that someone expecting the runway to be to the right of the PAPI would land on the taxiway UNLESS they were well briefed on the 29 PAPI position.
while there are other lights to help a pilot find a runway, this papi business should be considered...think about it.