#4 Eliminating Finn Balor too early
Believe it or not, WWE has made this mistake too many times.
Also believe it or not, the WWE Universe got so angry at the company for eliminating Daniel Bryan too early from the Royal Rumble in 2015 that they almost rioted. Of course, WWE corrected the issue by inserting Daniel Bryan into the Fastlane main event later on, but it was still a very dark time for the company.
With the Royal Rumble only a short time away, there are a few superstars that WWE probably can't get away with eliminating early. If they do however, they most likely risk angering fans and totally taking the wind out of what should be a huge moment for the company and the winning superstar's career.
Unfortunately for WWE, that means they need to play it safe and keep Finn Balor in the match for as long as possible. Of course that doesn't mean he has to win the whole thing, but the company could at least put him in the final four and maybe even set him up for a nice WrestleMania feud in the process.