I've currently got the following in place.

• dynamic day/night with on screen time display (and off/on toggle)
• lighting
• footstep sounds
• blackjack minigame
• gab message windows
• camera zoom & panning control
• layered weather
• a functioning atm with a randomly generated balance
• different atm cards
• timed conversation responses (shown via identically timed game timer until i can figure out how to call the response time for a gauge display
• event/player chase
• Telephone with number input (key pad style entry would be nice)
• Television with channel input (for hidden channels :D), "channels" are stored in maps, invalid channel entry results in static
• Lights turned on inside are visible from the outside by a combination of dynaic light off/on, and sprite based windows rather than tileset based
• Sokoban puzzles
• Event stacking to achieve for example, a sewer grate covered by a pushable crate which requires a tool to open, as well as potential requirements to move the crate
• Custom game font
• Randomized music to prevent boredom while play testing and for atmospheric testing
• script calls to simulate "business hours" with appropriately locking doors, flagged lights, and other graphic adjustments.
• timed traffic lights with crosswalk light, timed independently of the day/night cycle (to prevent stupid fast/slow traffic light cycles)