#4: The Undertaker and Vince McMahon had a "falling out" over AEW last year
Although this documentary doesn't refer to "All Elite Wrestling" by name, Pro-Wrestling fans knew exactly what The Undertaker was referring to in one instance during Chapter 4 of The Last Ride.
As mentioned previously, Undertaker was slowly opening up to the public via social media and appearance gigs, and as a result, he was scheduled for last year's Starrcast II convention, which in itself was associated with AEW's Double or Nothing Pay-Per-View.
Mark Calaway wasn't keeping up with the industry at that time, and he figured the event to be a normal meet-and-greet gig. He wasn't aware of being associated with AEW indirectly, and all of that became clear when Vince McMahon contacted Mark about it.
Apparently, Undertaker and Vince's friendship went through some friction at that point in time, where Vince became insecure about The Deadman possibly jumping ship over to a rival promotion.
Clearly, The Undertaker found this to be absurd and questioned why he would even consider that as an option despite being loyal to WWE forever. They didn't talk for a while, but this issue was resolved when Vince and Undertaker came to understand each other's points after talking it out over the next few weeks.