Law 18 Touch, quick throw and lineout. has the most amendments (8 in all, out of a total of 23 changes made in May of this year.) so worth a look at the link below, as its a little bit complicated to cut and paste them here. Excessive number of amendments to the variations of the LotG as well, U19 variation, Sevens and 10_a_side game.
From elsewhere on the forums.
Law 19 Scrum
[LAWS]19.15
MAY 2018 LAW AMEND
When both sides are square, stable and stationary, the scrum-half throws in the ball:[/LAWS]
[LAWS]19.15 f)
MAY 2018 LAW AMEND
Straight. The scrum-half may align their shoulder on the middle line of the scrum, thereby standing a shoulder-width closer to their side of the scrum.[/LAWS]
[LAWS]MAY 2018 LAW AMEND
19.22The hooker from the team which threw in the ball must strike for the ball. Sanction: Free-kick.[/LAWS]
Law 21 In_goal. rounds up with two final amendments
[LAWS]MAY 2018 LAW AMEND
21.14 If a player, who is in in-goal, catches or picks up a ball that is still in the field of play, that player has taken the ball into in-goal.
21.15 If a player who is on or beyond the dead-ball-line, or who is in touch-in-goal, catches or picks up a ball within in-goal, that player has made the ball dead.[/LAWS]