The original soundtrack contains cover versions of 1970's hits, while in the movie, contains the actual versions by their respective artists. For example, "Goodbye to Love" is performed by Phoebe Bridgers on the soundtrack, while in the movie, it is performed by The Carpenters.
When training on the poles, Stuart sits down and pulls out a lunch box. On the box is Scarlet Overkill, the antagonist in Minions (2015).
Vector, Gru's nemesis in the original Despicable Me (2010), is seen briefly in a photo on his father's desk.
While opening the secret entrance to the bank you can see "El Macho" character, from Despicable Me 2 (2013), without costume leaving a teller.