I think I know a little bit about Family Guy.
I feel like I have to explain this a few times a year.
FGY didn't sell that great at the start of '07, so they planned Shrek to use up all the parts.
However, as Fall/Xmas of '07 hit, sales of FGY picked up...and the game remained in production thru the end of '09. They made Shrek anyway, but they no longer "needed" it to use up FGY parts.
I don't know how many Trons were made, but there are about 2500 Family Guys. Based on what someone earlier in the thread said, I don't think Tron hit those numbers...remember, Tron came out when pins weren't moving the amount of units that they used to.