There is a neat glitch in the first three MCF games (though it feels harder in Huntsville and Ravenhearst) that allows you to skip all the levels after completing the first one.
Pulling this off requires some really hard mashing on the "NEXT" button that appears after beating the first level. Normally, hitting this button moves you to the next level, but it seems that if you mash fast enough, each additional mash will skip 1 level. If you mash enough times, you will be brought to the screen that is supposed to be before the final level in which you find the jewel box and stuff, but when you hit "Start Investigating" it brings you to the message from the Queen which means you beat the game.
This glitch is odd mainly because it's weird to think that the developers oversaw this bug. Though, it's not a simple skip to pull off as it requires fast mashing on your mouse. I think this might be lag based, though I'm not positive.
Oddly, your time isn't displayed in the "top agents" list on the main menu after you finish. However, you can still see your time in the save file menu and on the jewel box level screen.
EDIT: It has been confirmed to be lag based. You'll need a slower computer to pull this off.
Here is my really old video demonstrating this:
