All the Nintendo Easter Eggs in LEGO City: Undercover - Guide - Nintendo Life
LEGO City Undercover Walkthrough: Kings Court Collectibles - LevelSkip
LEGO City Undercover - Brickipedia, the LEGO Wiki
LEGO City Undercover (Wii U) - Mario Related References/Easter Eggs - YouTube
In LEGO City Undercover, some of the vehicles have license plate numbers. If you look these numbers up, they're the set numbers for the real toy. : r/GamingDetails
Kings Court - LEGO City Undercover Wiki Guide - IGN
Lego City Undercover Cheats - Video Games Blogger
LEGO City Undercover Walkthrough: Kings Court Collectibles - LevelSkip