The computer the Doctor is holding while the Tardis is on top of the tree with Isaac Newton is an Amstrad CPC 464.
The TARDIS HADS teleport works properly this time, unlike when the Eleventh Doctor had to chase it down.
The Second Doctor (Patrick Troughton) quoted "Wild Blue Yonder" at the ending scene in The Underwater Menace: Episode 4 (1967).
The Fourth Doctor (Tom Baker) stated to Romana (Mary Tamm) that he met Isaac Newton and dropped an apple on his head in The Pirate Planet: Part One (1978). But here it's the Fourteenth Doctor and Donna who give him the idea.
This is the sixth time Nathaniel Curtis has played a character in Doctor Who. He previously played as Lancelyn Green in the Torchwood audio The Five People You Kill in Middlesbrough (2021), Don McNeil/Zeta Hydan 1 in Unit: Brave New World (2022), Vijay in Torchwood: Among Us (2023) and Garth in The War Master (2017).