#3 Booking a throw-in match
WWE has an unexplainable habit of booking random throw-in matches the day of the PPV. The most recent example of this is pictured above, as Heath Slater and Curt Hawkins went toe to toe just before the huge fatal 5-way main event.
Of course, the camera wasn't focused on these two for very long as the main attraction was Braun Strowman being pulled from the wreckage backstage. But why bother with this match at all? It's just disorganized.
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Another example that has stuck with me strictly due to its randomness was the impromptu Curtis Axel vs R-Truth match that took place at Fastlane in 2016. That match also took place just before the main event, and had fans bewildered and bored. It was just unnecessary.
This isn't something WWE does very often, but it does happen. And although this shouldn't need to be said, they need to avoid doing this at all costs at a PPV as important as SummerSlam.
One of the worst things they could do is take the steam out of the crowd by booking something like Mojo Rawley vs Konnor just because they feel like it.