Maya Forbes' sister, China Forbes, performs the song "The Northern Line" over the end credits, a song for which she also composed and wrote the lyrics.
The film takes place in 1978.
Mark Ruffalo and Zoe Saldana appeared in the Marvel Cinematic Universe as Bruce Banner/The Incredible Hulk and Gamora respectively. They would both go on to appear together as those characters in Avengers: Infinity War (2018) and Avengers: Endgame (2019).
Mark Ruffalo's character tells his family, when the van is about to leave, that he wishes he wasn't dressed like a big green bug (green Polo Shirt and matching shorts). For years, Ruffalo played the Incredible Hulk, who is notoriously big and green.