BeBe Zahara Benet and Thorgy Thor (Episode 2) also competed against each other in Season 3 of Rupaul's Drag Race All Stars.
Of the 40 contestants, 7 of them have competed in the Rupaul's Drag Race Franchise, and won. Also, one of the judges, Bianca Del Rio, is also a crowned queen of the franchise, winning Season 6.
David Burtka and Neil Patrick Harris appeared together on Season 6, Episode 10 of Rupaul's Drag Race as Guest Judges where Bianca Del Rio was a contestant, and later on ended up winning the season.
Of the 40 contestants, 25 were also contestants on Rupaul's Drag Race.
Latrice Royale and Willam (Episode 5) also competed against each other in Season 4 of Rupaul's Drag Race.