Director Carlos Saldanha became interested in casting singer Bruno Mars in his first voiceover role after seeing him on Saturday Night Live (1975). After working with Mars, he rewrote his character to make him less 'macho' and, after a recording session, had a segment reanimated to fit his singing.
There are roughly 150 Spix's Macaws that make up the giant "2" of the U.S. teaser poster. The number of Spix's Macaws within that formation seems to loosely follow the real-life population of the species left in existence (most of which are kept in captivity around other parts of the world).
In an earlier written storyboard concept, Linda and Tulio's adoptive son, Fernando was to have extended involvement in the film's story. This would have included him going on the Amazon expedition trip with his adoptive parents to assist them in their search for the flock of hidden Spix's Macaws (albeit also showing his newfound skills in field work). However, it was cut due to pacing reasons and was only given a cameo at the beginning, revealing him to have matured physically.
During the scene where Carla and Bia are flipping through channels on the TV, there are clips from previous Blue Sky Studio films shown briefly prior to Linda and Tulio's news report: Ice Age: Continental Drift (2012) and Epic (2013).