#4 The Timekeeper can ring the bell without the Referee's command
Yes, you read that right. This is a rule that fans recently got to know about a few years ago. During what was built as "The match too big for WrestleMania", Brock Lesnar and The Undertaker squared off at SummerSlam 2015, one year after The Beast broke the undefeated streak of The Dead Man at WrestleMania XXX.
The ending of the match saw a bizarre new rule being introduced as the referee failed to notice The Undertaker tapping out to Lesnar but the Timekeeper spotted it and rang the bell without the referee's commands. After a lot of confusion, the match was restarted and Taker made Brock pass out to his Hell's Gate Submission lock.
While the match was memorable, the incident between the referee and the timekeeper was something fans had never seen before. It would be interesting to see whether WWE uses this finish again in any of their matches or not.