Swift also spoke about all the ways she uses Easter eggs – or secret messages to fans – to tease her music.
She said she has rules for these covert clues in her music and performances.
“I’m never going to plant an Easter egg that ties back to my personal life. It’s always going to go back to my music,” she said, joking that some fans are so good at decoding her that it’s almost gotten a bit “zodiac killer”.
The secret messages are “something that you don’t know I’m saying for a specific reason, but you’ll go back and be like, ‘Oh my God!'”
She said her favourite example was a speech she gave when she received an honorary doctorate.
“I put so many lyrical Easter eggs in that speech that when the Midnights album came out, after that, the fans were like, ‘The whole speech was an Easter egg!'”
She also spoke about her love of numbers and dates.
“I love math stuff,” she said, saying 13 was her favourite number.
Travis, she said, is “87” – the number he wears on his game jersey – and she noted that 13 plus 87 equals 100.
Some of her hidden messages are so complex, she said, they are crafted “upside down, backwards in Braille”.