There are several references to Sheen's run on "Two And A Half Men." At the beginning of the very first episode of the first season, we see a P.O.V. shot of Sheen punching someone saying, "You can't fire me, I quit! You think you can replace me with some other guy? Go ahead--it won't be the same! You think I'm losing, but I'm... well, you get the idea." In the fourth episode of the very first season, we see Charlie wearing one of the bowling jersey's his character wore on "Men" as well.
Despite having the same-name as the Adam Sandler-Jack Nicholson movie, the two have nothing in common except for the title, the fact that they are both star-vehicles and they are both produced by Joe Roth's Revolution Studios.
Laura Bell Bundy gets added to the regular cast.
Brian Austin Green gets added to the regular cast.
When Kate checks and reads Jen's tattoo she says the characters stand for "Sack of Rice".
Actually, when seen earlier on Jen's neck the Chinese characters do say "Sacrifice".
Of course this was meant as a joke but the viewers should know the truth.