This will be Will Arnett's second animated film in 2017. He is also in The Lego Batman Movie (2017) six months prior.
The poster of the gang in the acorn is a homage to the poster of Monty Python and the Holy Grail.
In this sequel, the nut shop is called, "Nibbler's Nuts". In the previous film, _The Nut Job (2014)_, the shop is called, "Maury's Nuts". It's possible that the last name of Lana, King's girlfriend, is Nibbler.
Maya Rudolph's was 2nd animation film, just 2 weeks after The Emoji Movie (2017) released.