The rumor that Jimmy Fallon caused those was said to be completely false, for what it's worth.
Three segments in particular got big cuts, and they were all things with build. The Revival vs. Balor Club was originally scheduled to go much longer than it did on that episode of Raw, but had to be rushed through. The re-match was booked for Royal Rumble, went much longer and saw the Revival go over.
Matt Hardy and Bray Wyatt, which had been a big program for WWE, had five minutes cut from it. They continued the feud throughout the Royal Rumble and the following WWE Raw. The two had to abruptly go into a finish after a brief back and forth exchange.
The main event segment featuring Kane, Braun Strowman and Brock Lesnar was extremely rushed as many who were watching could tell. With the show already running long, they were told to go ahead and get the segment going and accomplish their goal as quickly as possible to get off the air.
We'll have more exclusive WWE notes on Friday in the Fightful Wrestling Weekly.