Jamieson, Fausset and Brown on Mark 4:33

33. And with many such parables spake he the word unto them, as they were able to hear it--Had this been said in the corresponding passage of Matthew, we should have concluded that what that Evangelist recorded was but a specimen of other parables spoken on the same occasion. But Matthew (Mt 13:34) says, "All these things spake Jesus unto the multitude in parables"; and as Mark records only some of the parables which Matthew gives, we are warranted to infer that the "many such parables" alluded to here mean no more than the full complement of them which we find in Matthew.