Kaleb said..
According to the Talmud and Josephus, on Nisan 14, the priests would hand over the first of thousands of lambs for the Passover Seder meals beginning at 12 noon and stop (I'm sure you meant start) the slaughtering beginning at 3 pm so roasting could be....
The Wars of the Jews, 6.423
Flavius Josephus translated by William Whiston
423So these high priests, upon the coming of that feast which is called the Passover, when they slay their sacrifices, from the ninth hour till the eleventh, but so that a company not less than ten belong to every sacrifice (for it is not lawful for them to feast singly by themselves), and many of us are twenty in a company,
This is interesting.
The Synoptics specifically time the death at the 9th hour (3pm) on the day of Passover. Might the writer of Mark taken Josephus literally. As it reads (in English anyway) it could be understood that slaughter started at 3 the day of Passover.????
Another thought is that an original form of Mark did not identify the last meal as the Passover Seder but a later editor more distanced from the Jewish traditions did. Matt and Luke followed. In which case John, in this detail, might preserve an earlier form of the story.