In the surveillance center, when the alarm goes off, Resetti will call out "Code 64." This is thought to be a reference to the Nintendo 64.
During development, the development team explored the use of WiiConnect24 in the hopes that a player could visit a friend's town even when he or she was not playing. The friend could then leave letters or gifts. Additionally, they planned to use Wi-Fi Connection to allow simultaneous play. It's unknown why these ideas were scrapped.
Ankha the cat's snake charm on her head was removed and replaced with a head pendant for unknown reasons.
Totaka's song can be found in this game. At the beginning of the game, while you are choosing your town's name / your name / your gender, wait a few minutes and you can hear the bus driver whistling the tune.
Every New Years Eve, the player will receive a New Years Shirt with the upcoming year's chinese zodiac animal. Oddly there are shirts for the years 2000 through 2008, which are impossible to obtain without altering the internal game clock. The special shirts stop at 2035.
In the City, there are two traffic cones on the far right side. On some nights, after 8 o'clock, one of the cones can be moved and the Reset Surveillance Center can be accessed. There, Mr. Resetti can be found in his whole body. He bribes the player with a silver shovel and says not to tell anyone. This explains why he knows when you haven't saved.