It's always bothered me somewhat in the back of my mind that Jesus reclined when eating the Passover with his disciples. Just recently this bother has come to the forefront of my brain and I realized that it means that Jesus did not always do Bible things as prescribed by the Bible.
When the Passover was originally instituted, the Israelites were told to eat it dressed, with staff in hand, standing, and in a hurry (Ex. 12:11). To my knowledge, these instructions were never rescinded. And yet by the time Jesus eats the Passover, he has dropped the Biblical pattern for the "new" pattern of his culture, one of relaxed leisure (Luke 22:14).
Furthermore, originally the instructions stated that one was not to leave the house at all on the night of Passover (Ex. 12:22b), yet Jesus led his disciples out of the house after the meal (Luke 22:39). Again, Jesus fails to "be Biblical".
What do we do with this information? For those of us who have traditionally been sticklers for doing Biblical things in Biblical ways, this is a mite uncomfortable.
Discomfort is good for us; like exercise is for the muscles, spiritual/mental discomfort is for the soul.