I simply tell them they failed and let them draw their own conclusions. Otherwise so many aspects of the game would be given away too soon. Mafia is one part people skills, one part planning, and one part detective work. Take away any part and the game suffers.

The sky is the limit, man. I'd surf some finished games and look for where the game ended and the roles were revealed. It'll give you some great ideas to build off of. Oh and steer clear of the Jester role. That one seems like a great idea, but usually ends in misery.

Well, there a million different kinds of trackers you can have. Finding out different things. (who they targeted, who targeted them, powers etc.)
Doctors, Bodyguards
People who can influence the vote (Bribers, Senators that can over turn a vote etc.)

What's a jester?

And the bribers is a good one!

Someone who wins if they are lynched.

In Smash Bros, I had a briber: Fox. Although, I called him a leader instead. Such a good leader that who ever he targeted at night would vote for whoever he voted for.

That Jester thing is kind of stupid. I'd just try to get lynched on the first day but pretending to slip my role.

I like the variation on the briber though, leader is a good one.

The Jester is an incredibly idiotic role and should, in my humble opinion, be avoided like the bubonic plague itself!

Q in Star Trek had a 50% chance of that. He was also a misdirector himself.

Another random question. Say a cop gets misdirected. Do you just tell him the alignment of the person he got misdirected to, or do you actually let him know he's been misdirected and who to?

Personally I would say:

You investigate (target's name) and find him to be good/neutral/evil.

That's all.

Everyone who targeted me got misdirected in the Muppets game while I was the Chef! Then things got...a little different. (ended the game as Hoggle. )

Yeah. I still don't know half of what happened in that game.

I say the "portrayed" Max Lord money power could be fun.

Now is 'target's name' the target the player chose, or the target the player gets misdirected to?

The target the player chose.