When Vince McMahon came out to introduce The Undertaker, he actually said "WWF" for the first time in 18 years.
After The Undertaker spoke, his trademark bell tone tolled 10 times, which is based on the usual "ten tolls of the bell" given by the timekeeper when a wrestler dies.
Coincidentally, The Gobbledy Gooker had debuted at the same Survivor Series (1990) as The Undertaker, and was featured on the kickoff show, where he won his first ever WWE 24/7 Championship.
Survivor Series (1990), where The Undertaker made his WWE (then WWF) debut, was exactly 30 years ago to the day of this WWE Survivor Series (2020).
Only the ninth WWE pay-per-view in which no championships were defended. The others were: Survivor Series 1987, Survivor Series 1988, Survivor Series 1989, Royal Rumble 1990, Survivor Series 1990, King of the Ring 1995, In Your House 9: International Incident and Survivor Series 2017. All champions competed in non-title matches.