Cool idea for a thread! Here's mine!
1. The game *feel* was inspired by a song I attached here. If I used it as a background (which I would love, but have no rights to) the first meteor would hit exactly on the first time the vocalist goes "rules of nature!!". Right now it happens slightly sooner.
2. To make the city feel like a city I would need to create a bunch of building prefabs. Instead I created exactly one, with different interchangeable parts, and a script. You see- the city isn't random, and instead has a script that has bunch of code that tells generator that some pieces go after another, or there can't be more than such-and-such pieces in a row. This turned out to be a waste of time, because at the speed that the game works player can't tell it anyway.
3. At some point, some of the npc cars could be rammed for points! This got scrapped because I didn't like the game balance of that mechanic.
4. For the most of the development time the car player drove was an orange muscle car. I switched it maybe three hours before submission deadline when I figured that it would be cool to see all the money you collected inside the car.
5. The "long lines of money" appeared at first due to a bug in code, but I liked them (I felt they were a nice reward, but often risky to get, so a nice risk-reward mechanic), so I fixed the bug, but also created some code that generated them on purpose.
6. I have a method in my code that's called DoCrimes(). If the traffic generator calls it on a newly created car, this car drives faster, changes direction more often, and drops money.