Exodus 12:38 - The "mixed multitude" who left Egypt (not just ethnic Hebrews), heralding the covenantal quality of God's acceptance: not by ethnicity, but by adoption.
I Corinthians 5:6-8 - Paul's use of Passover language to illustrate the nature of New Testament fellowship.
Matthew 26:26,27/Luke 22:20 - "This is My body". Christ's fulfillment of the seder's ritual eating of the matzoth and the drinking of the four wine-glasses.
John 13 through 17 - The "Passover Discourse": Christ's fulfilling of the seder's "haggadah" [the "telling"] when the master of the feast applied the Exodus lesson for all in attendance.
John 11:55 - The first century rabbinical schools with their pilgrims arrive in Jerusalem for the holiday.
Psalms 120 through 124 - The "Psalms of Accents" sung by First Century pilgrims during their climb up Mt. Zion to sacrifice the lambs in the Temple.
Psalm 136: (with the refrain "Key L'oLAM KhasDO"/"His mercy endures forever!") sung antiphonally by choruses during Temple days, and still read responsively in Jewish homes at the conclusion of Passover seders.
Psalm 113-118: (sections of which are named the "Hallel"/the "Praise") recited or sung at least as far back as the Apostolic days at the conclusion of Passover meals. When Jesus and the disciples "sung a hymn" (Mt. 26:30) at the conclusion of the Last Supper, it was likely from here.
Matthew 26:18 - The Passover purification, including the removal of leaven from each dwelling.
Luke 12:1 - "Beware the leaven of the Pharisees": Christ's use of the earthly purification ritual to illustrate its ultimate spiritual significance.
Exodus 12:8/Numbers 9:11 - The Torah's requirement that the lamb be eaten with bitter herbs.
Acts 5:35/Acts 22:3 - NT reference to Paul's teacher Gamaliel, the rabbi who is quoted each year during the seder meal.
John 13:21 & 26 - Jesus and Judas mostly likely "dipped the sop" in bitter herbs at this time. This is a ritual dipping ceremony illustrating the bitterness of slavery.
John 6:32-35 - Jesus declared Himself to be "bread", a fulfillment of the liturgical "This is the bread of affliction" statement made by the master of the feast.
Exodus 12:39 - The reason why matzoth [unleavened bread] was eaten - it was "the bread of haste". They were fleeing the Egyptian army, and they had no time for the bread to rise.
I Corinthians 11:25 - The "cup after supper", most likely the drinking of the 3rd of four cups of wine.
Matthew 28:29 - The cup that Jesus would not drink until his brethren were in heaven with him; most likely the 4th of the four cups.
Matthew 24:1,2 - The reason why Jews cannot sacrifice lambs anymore: the Temple's destruction and their world-wide dispersion ["Diaspora"].
John 13:3-5 - The foot-washing at Passover, Christ's teaching application of the ceremonial washing ritual.
Mark 7:3 - a reference as to why Jews historically had so many needless washing rituals: their conscience was defiled due to the Law's effect on their hearts.
Matthew 15:3 - Christ argues with the Pharisees: grace vs. legalism; a confrontation between the traditions of the elders and the pure word of God.
John 21:20 - The "reclining at table" custom, reflected in John's reclining with Jesus.
Deuteronomy 28:58 - The plagues on the Egyptians, and a warning to the Covenant People, both Jews and Gentiles.
Leviticus 26:44/Romans 11:12 & 15 - a promise to regather the Remnant - both ethnic Jews and Gentiles in a "New" Jerusalem, despite former covenant disobedience.
Matthew 26:30 - The singing of the Great Hallel (Psalm 136) at the end of the Passover seder.
Matthew 11:7-15 - the seder's chair for Elijah the Prophet, a custom that finds its fulfillment in the coming of John the Baptist.
Ephesians 2:20/I Peter 2:5 - the rebuilding of the final temple; not of stones, but of human beings, and the fulfillment of the seder's concluding prayer.