To cycle night and day in 3D mode press Down, Up, Down, Up, Down, L2, R2.
To turn it off press Down, Down, Up, Up, Down, Down, L2, R2

To fade the screen to black press Down, Down, Down, Down, Down, Down, L2, R2.
To pause the fade press Left, Left, Left, Left, Left, Left, L2, R2.

To return the screen to normal press Right, Right, Right, Right, Right, Right, L2, R2.

Use of any of the dispatch tools (Fire, Police, Military) will yield the maximum number allowable within SimCity regardless of the number of stations you have. To activate, use the normal arrow cursor to select and cancel the dispatch tool. Go to the status bar and press Left, Right, Left, Right, Cancel, Accept. Be sure your cursor stays in the status area while doing this.

Select Budget from the City Info menu. At the Budget Screen; hold Triangle and press L1, L2, L1, L2, R2, R1, R2, R1.

Be careful, because this could result in fines of up to $100,000.