The Simpsons Hit and Run Wiki

Enter Skip Storage

Description: Enter Skip Storage (also known as ESS) is a trick done throughout the run which allows you to skip most of camera pan-ins.

How to perform it: You need to call a car from a phonebooth and during the camera pan-in you have to press your change camera button. Then when you warp you'll see "[Enter] skip" at the bottom of your screen it means that ESS works, now you just have to press your enter button and you'll skip the camera pan-in.

Warning: -You can't press enter after you get ess unless you are trying to skip a dialogue so don't mash your enter button.
-Your enter button can't be assigned to other than the enter action so check your options

There's a lot of camera pan-in which can be skipped but their timesaves vary depending on the length of the camera pan-in. Here's the length of every camera pan-in: link
If you didn't fully understand how ESS works and how to perform it you can watch this video which explains everything you need to know:link