Cricket: The only game where the captain makes all the decision – after winning the toss whether to bat or bowl, who will bowl, when to change the bowler, how to rearrange the field, who to send to bat in which order, when to declare the innings. In other sports, captain is only for toss up.
Baseball: The catcher (ala wicket keeper) tells – via signal – the pitcher (ala bowler) what kind of ball to throw (ala bowl).
Volleyball: the libero (defensive specialist) is the player that wears a different color jersey from their teammates. The libero is a specially designated player that is allowed to replace any player in the back row without the need to substitute. They may never play in the front row.
Soccer (Football): The goalie wears a different color jersey other than the rest of the team.
American Football – The games go on no matter what – Rain or Shine or Snow or Thunderstorm or national mourning. Two days after President Kennedy was assassinated the NFL (National Football League) games went on as usual. The then NFL Commissioner Pete Rozelle later said it was the biggest mistake of his career.
Golf – It is the game where a golfer does not get a point on the opponent’s mistake.
Ice Hokey: It has 2 intermissions in each game. A total of 3 periods, each with 20 minutes.
If you know any other sports which are unique, please let me know