When Lois goads her sensei with "Spin the wheel, raggedy man", she is referencing Mad Max Beyond Thunderdome.
The last episode with the original theme song in which you can hear Chris and Brian's voices separately.
When they go to church, Lois is once again wearing an outfit in the style of Jacqueline Kennedy.
The title is a reference to the Lethal Weapon film series.
During the church scene one of the New Yorkers tells Peter that the "Patriots suck" in reference to the New England football team. Less than six months later the New England Patriots would go on to win their first of five Super Bowl titles and judging by the fact he said "Patriots suck" he is likely a Jets fan who is the Patriots rival.