Both this and the first film had a 1 year gap between the release of a film in Disney/Pixar's Toy Story Franchise. Gnomeo & Juliet (2011) came 1 year after Toy Story 3 (2010) whilst Sherlock Gnomes (2018) came 1 year before Toy Story 4 (2019). Both of these franchises are about Inanimate Objects coming to life whenever the Humans aren't around.
Both Chiwetel Ejiofor (voice of Gnome Watson in this film) and Experienced Voice Actor Jim Cummings (voice of Featherstone in the first film) had been in an iteration of The Lion King, which also had music done by Elton John. Cummings had been in the Original 1994 Animated Film as the voice of Ed, whilst Eijofor had been in the 2019 Live Action Reboot as the voice Scar.
Both Gnomeo & Juliet (2011) and this movie come out in the same year as a Winnie the Pooh film. Gnomeo & Juliet came out in the same year as Winnie the Pooh (2011), whilst Sherlock Gnomes came out in the same year as Christopher Robin (2018).