Depends. The “On the nth Day of Christmas, My True Love Gave to Me”, the ‘of’ means ‘after’. This use of ‘of’ is obscure now, but when the song was written it didn’t need explanation.
So it would be ‘on the first day after Christmas, my true love gave to me…’. Which makes January 6th (twelfth night) line up with the twelfth day after Christmas.
I bet that in Panel 2, the first two words in the fourth line were originally “The book”, but Delainey / Rasmussen decided that “Alex’s book” would be better. However, they didn’t move the full text further right to remain left-justified.
It’s always redhead week somewhere.