The 200th episode in the series.
Clark Kent is called "Superman" for the second time, in a newspaper headline Clark passes as he walks through the Daily Planet building on October 15, 2017. The first time was in season 1 episode 1 "Pilot".
The song playing in the gym while Lois and Maddie are talking and at the end while Lois and Clark are dancing is Everything by Lifehouse. This song was used at the end of "Pilot", the beginning of "Metamorphosis", and during Lana and Whitney's dance in Season One's "Tempest". It was also a Lifehouse song ("You and Me") to which Clark and Lana danced at their senior prom in "Spirit".
The falling helicopter scene on the Daily Planet is very reminiscent to Superman (1978).
This episode is very similar to the timeless tale, A Christmas Carol, with Clark watching scenes from his past, present, and future. Lois references it when she says "Humbug" at one point.