#1 Chris Benoit isn't mentioned, unsurprisingly

Daniel Bryan and Dolph Ziggler were the first two entrants in the 50-man match and as they were entering, the commentary team were discussing how it would be almost impossible for the two competitors to go all the way in the match.
Michael Cole mentioned that there had only been four men in history who had won the Royal Rumble from the #1 and #2 spots - "among them Mysterio, Michaels and Vince McMahon...". If you are wondering why Cole failed to mention the fourth, it wasn't due to a slip of memory but because of the fact that the other person on that list is Chris Benoit.
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After the controversial events surrounding Benoit's death in 2007, Vince McMahon stated that the WWE would not talk about Benoit going forward, and the company has stuck to its word 11 years on.